Malicious PDF — malware analysis report

Static analysis result for SHA-256 747fe5d482f97439…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dac12d25474e228c67d7016bb06e841 SHA-1: 57b7aebbe703e4d653575f15bf6ce44dbdc181c0 SHA-256: 747fe5d482f9743904b2f44c9415f6bc051392db7a2e6b50822a9c59fe6eca26
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a free Android manager for PC. The document also hosts a large number of other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or malware distribution attempt.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=android+manager+free++for+pc
    • http://garogaw.chelseanswagner.com/uploads/1/3/2/6/132695384/fb52d1.pdf
    • http://nogake.lilysparkles.co.uk/uploads/1/3/0/9/130969723/7685650.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/rutamamogoki.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/zawit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/videoder_premium_apk_14._1.pdf
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/76397967965.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/laxegokigasolapiwire.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/1969_cessna_150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/windows_8_dreamspark.pdf
    • https://cdn.shopify.com/s/files/1/0430/6619/6122/files/accountancy_class_12_ncert_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/take_five_piano_accompaniment.pdf
    • https://cdn.shopify.com/s/files/1/0434/5164/6119/files/free_afro_trap_instrumental_beats.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_off00005e91.bin
c5be186cf292d1ddf2ac8527cddb36178699c5de4c0954d53c7038848509d26b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E91 5256 bytes
font_01_sfnt_off00007054.bin
374d1cf7ab0781b75b9ce02722bc93a60e6f41e6b0c24a84f996c367fb3389fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7054 9984 bytes