Malicious PDF — malware analysis report

Static analysis result for SHA-256 6488e75b4f09fb14…

MALICIOUS

PDF

37.5 KB Created: 2020-08-10 02:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 168ef31ccdfd4f8506b60ca41b80563c SHA-1: 3856dd9cb5fc160b8231cc5d6b3b2bf42067ab6c SHA-256: 6488e75b4f09fb1408b62eb6ac72805514215874ed96e65d09268969593c70be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=boylestad+13th+edition+solution+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating a lure to download potentially malicious content disguised as academic material.

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=boylestad+13th+edition+solution+pdf
    • http://files.gerardgorman.com/uploads/1/3/0/8/130813546/1773785.pdf
    • http://kopefuf.stellarendurance.us/uploads/1/3/0/8/130814328/6970504.pdf
    • http://files.kofcstarofthesea.com/uploads/1/3/0/7/130739508/2c619.pdf
    • http://files.lifemissionmanteca.org/uploads/1/3/1/3/131383541/modanitisarepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/70705598086.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/apprendre_python_3._6.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/jifuxoxevesugunoxer.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/55827798630.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/52808407262.pdf
    • https://cdn.shopify.com/s/files/1/0430/4220/9945/files/unamused_emoji_text.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/deduwukisusitufuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/pebeseg.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/xosorogavabisewetebap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0206/8131/files/80143894217.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/fofebeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/alt_code_for_check_mark.pdf
    • https://cdn.shopify.com/s/files/1/0430/8313/7178/files/2701466517.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_off00005438.bin
e0712b8d4ebb0ebb943ea906116cf5d02b49098153dabd0631ab9de5765eb848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5438 5400 bytes
font_01_sfnt_off000066a8.bin
7c456e92a4989d56ed1918fde29480563e350df43d08bec5d2dbde7b74092ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A8 10000 bytes

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