Malicious PDF — malware analysis report

Static analysis result for SHA-256 81370c0f017fcaee…

MALICIOUS

PDF

51.7 KB Created: 2020-11-03 07:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73a0f678561c0ddc7030fd9ceb24bacf SHA-1: ea73de6fc87087e7e43163c1a58f6111c972ba89 SHA-256: 81370c0f017fcaee781766bb71c9e5aafe844458038c279be490ec59f5002d1d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a critical finding of a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for phishing.

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/123?keyword=bethware+elementary+school+nc In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/ab98791f6f.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/janokirojiguxo-wanutijid-kunatod.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/1/0483/4662/8259/files/lowewomidesuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/5269/2153/files/mojuxomabituwuvub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8186/8478/files/dimudufosozilaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791f2026-7d97-439e-9ee7-8190f4ea4209/10880355579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92a1d7c-4dea-41f0-9c11-139f49d63b5b/vakeputowinukuxaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5639/7987/files/zolodemowilinono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94eb075a-dac0-438e-8db8-1ecba37b1463/xuvazasisugibowuxas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/wewozepod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3232/0451/files/elektrotanya_service_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed980b6f-05d6-41b3-94d7-9786558ae083/ranusadufej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8276/7267/files/nook_apk_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157f019e-fb91-45dc-ab40-b55523ac54cc/29591288345.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8747 5280 bytes
SHA-256: bc18f73f8056c7c4f5487c424642b9713873b41107ef399a14e7dff89f584b03
font_01_sfnt_off00009925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9925 11980 bytes
SHA-256: b70998e64b84e4f580b62b0499fc8e582e15a37610569c45e3929d3337b6a44d

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