Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e8f788a679cbe…

MALICIOUS

PDF

66.1 KB Created: 2020-08-25 02:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 696d05afe3c25913a338aa9e16b8708f SHA-1: c21284f4aae0e07951da008ab81687674e405e3d SHA-256: 857e8f788a679cbe4efb1aeb3c6371431f00b27c85dd1139f5aba7afbea8fd55
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to an 'audit report' and a URL that appears to be part of a link farm designed to attract traffic. The presence of multiple Shopify links, some benign and some potentially malicious, suggests an attempt to obscure the true malicious intent. No scripts were extracted, but the primary attack vector appears to be the redirection of users to malicious sites via embedded links.

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=audit+report+qualification+on+going+concern
    • http://pawuwez.cantonohiolandscaping.com/uploads/1/3/0/7/130776321/3998718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/dejomigexijovav.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/byomkesh_bakshi_web_series_all_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5661/files/causas_de_candidiasis_esofagica.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7222/files/14991078687.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/26743787936.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/jokerilof.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/38477873502.pdf
    • https://cdn.shopify.com/s/files/1/0464/7688/6168/files/67066279185.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3784/files/vce_to_3._6._3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7123/4467/files/sekigezozidifujetaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2523/files/citrus_budwood_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/chemistry_a_molecular_approach_solutions_manual.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_off0000b863.bin
ed0ff21297bda7a1b38f959073d5702d5762c0af7d11ff64de44c31f24a3c689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 5144 bytes
font_01_sfnt_off0000c9e0.bin
f349c3b33858fb60ae337854a04590dba512a30bb41709cb1cc125c98b83e814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 10208 bytes
font_02_sfnt_off0000ecce.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 4324 bytes

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