Malicious PDF — malware analysis report

Static analysis result for SHA-256 e710e18cd3fbba00…

MALICIOUS

PDF

44.4 KB Created: 2020-08-10 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3b9040367317b4ab2f3d7487499320 SHA-1: 075d454d1d05539fa1720b387bb98f5e22a5e7f6 SHA-256: e710e18cd3fbba0041a3ee6c4d331f0b67da0f297d9d773b7352714bdb9a642e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to obscure the ultimate malicious destination.

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/pify?keyword=application+of+coulometry+pdf
    • http://files.westviewwildcatband.com/uploads/1/3/1/8/131871535/57a9f60.pdf
    • http://files.entertainmententerprises.net/uploads/1/3/0/7/130775292/4939448.pdf
    • http://jupesoge.kimreedphotos.com/uploads/1/3/1/6/131636612/danolesin.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/ketibot.pdf
    • https://cdn.shopify.com/s/files/1/0432/7617/3472/files/nfpa_72_certificate_of_completion.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/jazuzikivimevago.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/jizesujegajobagij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/c_linked_list_library.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/torazuluwunometajobun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51730359377.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/epidemiologia_basica_bonita.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/email_that_starts_with_e.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7318/files/49367645142.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/hannibal_barca.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/konukagugexoxora.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/2126306312.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/academic_word_list_with_arabic_meaning.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007068.bin
2ae33cb3849fff43b6eb50386441dd70cd8894dc8eb4e74c5fb51d8826c7a793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7068 5212 bytes
font_01_sfnt_off00008220.bin
74b2911a447e0b5f75b93cf10d34a6aee01b6ad25a6c663f2fdbcc62bb83d0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8220 10172 bytes

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