Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ef92978e9a48b3…

MALICIOUS

PDF

37.5 KB Created: 2020-08-18 21:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d131f4d9ca3c6c46ac8bd937db605770 SHA-1: ee3f8384a377ce94034817c8da9ee236c8a7d44f SHA-256: 21ef92978e9a48b34fbfd3abea26740e2bea97737e873e4e24585c60c6d2dd5f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to trick users into downloading something under the guise of 'message backup for facebook'. The ML classifier strongly indicates maliciousness, and the presence of numerous SEO-optimized PDF links further supports a phishing or scamming attempt. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=message+backup+for+facebook In PDF document text
    • http://files.artbyalisonnewth.com/uploads/1/3/1/6/131636678/a8070c1379591.pdfIn PDF document text
    • http://files.pavarinipr.com/uploads/1/3/1/8/131871390/pasenozuworasajed.pdfIn PDF document text
    • http://files.friendsfabricart.com/uploads/1/3/0/8/130874614/sikuxav.pdfIn PDF document text
    • http://waripiki.curiotheatre.org/uploads/1/3/0/9/130969360/f9131d.pdfIn PDF document text
    • http://files.laurenboehmlynch.com/uploads/1/3/0/7/130739379/54d45a9bbd402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/7003027999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/noneseberi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/negative_prefixes_to_form_antonyms_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8761/6413/files/bangsamoro_basic_law_latest_draft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/napalabubodepit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/wing_chun_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4618/3847/files/silakezuxit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/guidelines_on_internalised_settlement_reporting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/jevewit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/70055180779.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 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5475 5360 bytes
SHA-256: d01952083532435ac034031d4045db38ebcb9eea01260818419cc3a61a3b3517
font_01_sfnt_off000066d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D0 10128 bytes
SHA-256: 61ea2aeecc32e13e9c8bff4cefc5d1f4a412650aad6f77e9b33a93a7179272c5

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