Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf614c5eeb727e1…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 03:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7df8dd6cd3b6c08eb6c02f22e761f3c8 SHA-1: 3f9bde966af6c0cd69bf6b18de865f6324dedf64 SHA-256: 6bf614c5eeb727e12e8b3ba12ed7bcde93c5bcb2402feaf6ca14665740dcabdf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host other PDFs. One prominent link, https://ttraff.com/wb?keyword=micrologix%201400%20plc%20user%20manual, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and appears to be a lure for users searching for technical manuals. No scripts were extracted, but the presence of embedded links and the ML classifier's high confidence suggest malicious intent.

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.com/wb?keyword=micrologix%201400%20plc%20user%20manual
    • http://files.shsdebateyu.com/uploads/1/3/2/6/132682327/7f0c2.pdf
    • http://files.saunagoods.com/uploads/1/3/1/6/131636758/cbb38.pdf
    • http://files.alexheadadventures.com/uploads/1/3/0/7/130740625/776290ead9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/25690507473.pdf
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/75675160640.pdf
    • https://cdn.shopify.com/s/files/1/0436/1096/4131/files/84297512384.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/mobile_games_addiction_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/xbox_controller_button_layout.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/86484890566.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/zobajijedazonalexurotag.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/90520854502.pdf
    • https://cdn.shopify.com/s/files/1/0440/2996/8534/files/equality_act_2020_scotland.pdf
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/download_magic_arena.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/medical_genetics_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0554/files/60929935522.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cb5.bin
57020c1d3743c78c40bcdcf8008149ec549bca7cca9824650e58693ec1c74142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 5608 bytes
font_01_sfnt_off00006fc6.bin
46fa11ed44a934830a73eef2926ad7733fea4a561593c36db29f8631b6003747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC6 12412 bytes

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