Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc0c5ac7ec299d3…

MALICIOUS

PDF

45.7 KB Created: 2020-08-31 01:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de85c72a7b1fa2f7719d794aba5190c4 SHA-1: 07e7bb8120358f40d19ded437eae7f8026894d2a SHA-256: 0dc0c5ac7ec299d33e2df3a6cf5319dc7e2b7de466384b5b99ea4ed89df42563
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a printer service manual, which redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the presence of embedded URLs and the malicious redirector points to a phishing or redirection attack.

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.cc/wix?keyword=hp+laserjet+p4014+printer+service+ma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/gazedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/xujoxunujenofofikanisebew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/17991053341.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/lefepifilit.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/karmasandhan_bengali_paper.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/61787337193.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/70321610515.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/autobiographical_novel.pdf
    • https://static.usrfiles.com/ugd/b972d5_dba5d43839f147849687a236e3cc1174.pdf
    • https://static.usrfiles.com/ugd/ae059d_7b490cfd50fa4ef5bcfbf6d75c1dd7c4.pdf
    • https://static.usrfiles.com/ugd/87a178_c860dd40edd3473fab423e25d83d42c8.pdf
    • https://static.usrfiles.com/ugd/b972d5_9884f6ee52e94854910b2e4e4141d8f4.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/aditya_hridayam_in_tamil_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/journal_ledger_and_cash_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/cecile_chaminade_flute_concertino.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/13459978307.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006594.bin
04a343ca587bee0c8627e02ef4625ed751d68bd4603d1457755cda98fc044c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6594 5136 bytes
font_01_sfnt_off000076f4.bin
1ac7189ff6b5307f7067b6dfa59fe7b581cd89095bbe76373726d5f1c54cc4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10672 bytes
font_02_sfnt_off00009b60.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B60 4324 bytes

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