Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b888e339702b4…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3910b0efbd3afefc2db1a11ea124e42e SHA-1: a1f1217d392fb46cb23067b073fdf313b721bf67 SHA-256: f29b888e339702b48b5cf5bb70c17ae1ec2b68c0d463f78b777b9d516b15d5a1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL as the redirector, indicating it's the primary lure. The ML classifier strongly supports the malicious verdict.

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=adding+mixed+fractions+with+same+denominator+worksheets
    • http://files.theediblepharmacy.com/uploads/1/3/1/4/131453253/pijuleforerixijotu.pdf
    • http://files.wokingminiaturerailwaysociety.com/uploads/1/3/1/3/131382673/tigojofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/rivixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/exercices_d_orthographe_cm2.pdf
    • https://cdn.shopify.com/s/files/1/0438/7821/9944/files/koroturomiwopenefatakir.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/project_nevada_tale_of_two_wastelands.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/dakexukosobokuxefikebog.pdf
    • https://cdn.shopify.com/s/files/1/0434/6629/3401/files/33520547366.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/gijuvimeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/80867836289.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/xegutenoxufoparevekonan.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/vesepoxobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/15869179036.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/71940828100.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/70196383764.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/marketing_communications_ebook.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc5.bin
44255841eb53d826500660a1e899080112b280617b4b594156921c6bab6cd4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 5616 bytes
font_01_sfnt_off00006fba.bin
e98b03ad6f6d58ae6ceeb95a8ac9324ada883584b35054761754af70446d9f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 9928 bytes

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