Malicious PDF — malware analysis report

Static analysis result for SHA-256 67902f578cac2b9f…

MALICIOUS

PDF

38.3 KB Created: 2020-09-10 11:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16f06523ec48bed9101ba6bc545af45 SHA-1: 0f55b7a9cad7df5597d4f6089a008373749bc6df SHA-256: 67902f578cac2b9f57df9e836a045e1cbb23a7d7c5a7155da15be6319963ffd2
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'gold rush boomtowns worksheet' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are to benign-looking PDFs, likely to obscure the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest a phishing or malware distribution attempt.

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.club/wix?keyword=gold+rush+boomtowns+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d01287_6f3791d629b341aeb8f040e25a0a7b6c.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_88d4fff19de24ff490bdf73bd69331c8.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_33c6e3b8dc694f568666a56754f87ab5.pdf
    • https://static.usrfiles.com/ugd/8e66a5_ac225ba1d6a64820a22eb19533047bf0.pdf
    • https://static.usrfiles.com/ugd/0b46e6_c6330ae5a5014d01a637c83b77bcc190.pdf
    • https://cdn.shopify.com/s/files/1/0435/0309/1876/files/kitchen_utensils_vocabulary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/22247392588.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/hans_zimmer_interstellar_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/bedingte_wahrscheinlichkeit_aufgaben_vierfeldertafel.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/xuredoxunapoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/parker_pneumatic_valve.pdf
    • https://static.usrfiles.com/ugd/738632_89dd30b6fb4142b4a0de3fbc52c1cb5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f47abcdb9904945a9c1c2bf44638d6d.pdf
    • https://static.usrfiles.com/ugd/afe78f_7601e4a4fb2c4e92a57fa9a07bd87639.pdf
    • https://static.usrfiles.com/ugd/9b33c5_07cea50b4e904b50bddbfeb9273e4774.pdf
    • https://static.usrfiles.com/ugd/d54300_5a7237e787834445b4b31c34a451447e.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_off000058bd.bin
87f2585c5e6c98c36e3bff0d3d29fdaf079fece6967a2b4e39eb462ff941638a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BD 5180 bytes
font_01_sfnt_off00006a42.bin
b68606076618eae2c4ef92e41e2400a88b68fc660d03f350008aaef5f65a16d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A42 10012 bytes

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