Malicious PDF — malware analysis report

Static analysis result for SHA-256 178dc1b4941216bd…

MALICIOUS

PDF

38.9 KB Created: 2020-07-30 16:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 408ede8dc83a5018309351673d66edfd SHA-1: 23c11cd56e4f809c02213bb38ad794b8a76ea35b SHA-256: 178dc1b4941216bdc5116c77550020d97e76088d6a4f2a03eb83f903933b44a3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to downloading a handbook, suggesting a lure. The presence of many external links, including to Shopify, indicates a potential SEO spam or link farm operation.

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.ru/pify?keyword=aiag+vda+fmea+handbook+pdf+free+download
    • http://files.leafsvanmij.nl/uploads/1/3/1/8/131857024/ab821cdf4d.pdf
    • http://files.nonamemotorsports.com/uploads/1/3/1/3/131380666/meginukutotaboli.pdf
    • http://files.musiciansdreamaid.org/uploads/1/3/1/4/131453065/71f9c9.pdf
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/dipozelafaratedaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/favamadilapat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/nivimutaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/5107/1126/files/3225673589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/meborenorinasazife.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/75111700064.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/46531126907.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/tebagesefukavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/54064488579.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/73011245133.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_off00005a55.bin
c3944a86e40473a5e55ea3ba9680e87361f7b7a222b2fd6cb398123b9b765794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A55 5332 bytes
font_01_sfnt_off00006c4d.bin
1d403def759177878f396d6a4e4051a67199186ddc05a94b4869ddc7bc986d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4D 9996 bytes

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