Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7ce1d8e95fc705…

MALICIOUS

PDF

42.6 KB Created: 2020-08-10 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d06c2ac57ebf7c559649db31cdde03a SHA-1: 1cf706c5f755b256eb6418b9ade9944302a3a5da SHA-256: 0c7ce1d8e95fc7055247c2ace0bd9d77c543d2e171edf017e2573b8b629f454e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though partially garbled, contains the same malicious URL found in the heuristics, reinforcing the intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=chuy%25E1%25BB%2583n+file+pdf+b%25E1%25BB%258B+l%25E1%25BB%2597i+font
    • http://files.reformedholytrinity.org/uploads/1/3/2/7/132712116/kewafozok.pdf
    • http://sopim.roomsrevamped.com/uploads/1/3/1/6/131606490/a4ab82a.pdf
    • http://files.razberrydazzles.com/uploads/1/3/1/4/131406269/ddd95c2.pdf
    • http://files.pataskala404freemasons.com/uploads/1/3/0/8/130813650/3964132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/xepodisajosoripofelorab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/fubaxozuri.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/forozidudimidagidipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/145224363.pdf
    • https://cdn.shopify.com/s/files/1/0448/7141/8018/files/30198125544.pdf
    • https://cdn.shopify.com/s/files/1/0448/0018/0375/files/mathematics_formula_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0433/7949/0968/files/dutejerutemivuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/nulutogumufatagebafet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/best_reader_app_for.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/vifekekutipivibij.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_off000065ca.bin
122ff2665d90211301032efe6a59c04422d0acc7bc6cd76335aad9acbc2d7e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CA 5316 bytes
font_01_sfnt_off00007754.bin
ed4e37f77f6e4509a0b4a09cf17ae38979b4fb40836c99384608dfefb001a1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 11500 bytes

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