Malicious PDF — malware analysis report

Static analysis result for SHA-256 377cb160e4202166…

MALICIOUS

PDF

40.5 KB Created: 2020-10-12 08:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 74385db63de466f4e95d47b2b4a215f5 SHA-1: da64a09ae2ce2b84f7c0c9e96cf97e1f739a6d57 SHA-256: 377cb160e4202166dbb514142c6076031a170d8eb56c31d40eeeca14e0e6de2a
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that suggest a lure related to job opportunities. The primary malicious indicator is a link to a redirector service, which is designed to obscure the final destination and potentially lead to further malicious content or phishing pages. The presence of numerous external PDF links, many of which are benign, suggests an attempt to create a link farm or SEO manipulation, potentially to improve the ranking of the malicious redirector. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/pify?keyword=help+wanted+poster+ideas In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/085b9dc0-29ad-46ee-884d-af51d6ab100f/julexala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99bfb0ec-96f3-4482-9bfa-47b43f4f59c1/47560541681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d7c431-50d8-4b37-8c3d-e31146db19ab/juregefimunibemedutinolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ace0959-c63a-4bcc-b0c9-93e20a18e91a/34185589174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5285036b-50c3-453a-943a-d8dbead5b312/vineti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9887d8df-fe0e-4406-aec3-e4e399ace14d/kigufumaviramurifij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154aee20-44ed-4b09-8486-26bf937c9b55/vudubivemujelewusumofobum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cde258-df38-47ed-ad10-8cc0cc1df9e3/tibedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fb2880-6af0-42e1-805d-d324b8e65c1e/90255840013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7c84b3-93d7-44bf-8c31-fef7a5e2e8da/voritiwuwawafezoxut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5498/7936/files/the_death_of_the_heart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/mesobiremebewi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 5004 bytes
SHA-256: ff6bb5802ba0269f5919d6a011a03cd396fa2e766c6eda5f5f42ce11cff3b492
font_01_sfnt_off00007348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 10024 bytes
SHA-256: 0a431529905a51c9c9f656d62ddc69acd1c34a6cc1c316395d83c1ff82578ef2

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