Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d4b728687b8f39…

MALICIOUS

PDF

46.5 KB Created: 2020-08-02 16:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 072d6c11ca6e5bbf412d12c5480db99e SHA-1: b380cd27a5dabf6d26f7548dbb2179e5b505dbfa SHA-256: 78d4b728687b8f3900a5024834d8ab16a0b5a7cdba2d3188e773ce9256326bfc
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social engineering lure, presenting itself as a "Chrome view source" prompt to trick users into installing a browser extension or update. It contains numerous links to external PDFs, many of which point to a redirector infrastructure, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, supporting the observed lures and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=chrome+view+source In PDF document text
    • http://files.sterlinggracebrethren.org/uploads/1/3/1/4/131453451/11229029c98.pdfIn PDF document text
    • http://files.myerstownboyscouts.org/uploads/1/3/1/8/131871453/64739.pdfIn PDF document text
    • http://files.acquisdata.com/uploads/1/3/0/7/130739883/6805283.pdfIn PDF document text
    • http://files.risingnorthproperties.com/uploads/1/3/0/8/130874284/nedaxenojexiv_depoteter.pdfIn PDF document text
    • http://files.vwpitstop.com/uploads/1/3/1/3/131380495/8659607.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/bubamifidoserixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/82085467607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/gukibifetavokogonabotuwib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/91478859116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/68290585195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/17832115095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/74790317614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/3586254873.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/roar_tigers_of_the_sundarbans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/82594956574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/vikap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/13293866601.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 4668 bytes
SHA-256: a48fb749a5815d10d1af40fc8306759e299ab6f28a4a20dd221e9fcdfd85a5cf
font_01_sfnt_off00007bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDD 10200 bytes
SHA-256: 141794a264b65d5f0dc8b621187639d5b5f9a2621ec41bcce9d0d3a5e6b2158a
font_02_sfnt_off00009e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E74 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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