Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fe5c6d875ca97a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-06 21:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b172d4c62e440f032a9fefe94d2dfc SHA-1: 71c40880f99d7422dc7a45cb69c689379995ca74 SHA-256: 84fe5c6d875ca97a34553c38f6c82be48b25b70a6d3f5503ca66fe324111bfd5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com. One of the primary URLs, ttraff.ru, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting a lure to external malicious content. The ML classifier strongly indicates maliciousness, supporting the attack pattern of redirecting users to potentially harmful sites.

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/wb?keyword=aromatic%20heterocyclic%20chemistry%20pdf
    • http://vekaxage.sscvolleyball.pl/uploads/1/3/1/1/131164239/zedupunovam.pdf
    • http://files.bahaisofdallas.org/uploads/1/3/1/3/131384173/c36330a.pdf
    • http://files.milfordengineering.org/uploads/1/3/1/8/131857540/nepunijabofor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/jaxafowuduledurosumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/tedoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/gatajomukuvirozebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/understanding_financial_statements_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/ranulomubuxiwelizejoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/37379844586.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/wuvutafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/jusutunokifotudutujemox.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/ekvillian_songs_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/calculus_early_transcendental_functions_4th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/giwisegidilu.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_off00006f0f.bin
25501592492165d58dc4d2d450e7c50a3aa3afb16c0a83d51b8aff9823da821b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0F 5484 bytes
font_01_sfnt_off00008197.bin
0cd0396365c466e8ecd422c3013c6bea23b8dd532b5d79535edf7f120bd0dc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 14284 bytes

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