Malicious PDF — malware analysis report

Static analysis result for SHA-256 a502b8bda181b5df…

MALICIOUS

PDF

43.4 KB Created: 2020-09-07 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eeb2fae3005feb4a961e12f476f4804 SHA-1: eadf1338d32452e7800527a9e16452aeef75ff34 SHA-256: a502b8bda181b5df81402f0a14d13e24204a2b6a0191577c731ab87678e040de
152 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.club'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'single bed sheet set singapore'. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=single+bed+sheet+set+singapore
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5644/files/27526713042.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/womojaguwodomuzifem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/linear_equation_in_slope_intercept_form_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/candidiase_tem_cura_livro.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_eabd138aadb3412ab2b912c18bffe95f.pdf
    • https://static.usrfiles.com/ugd/2a2e94_f1b053d436ae46c4949e39941781e606.pdf
    • https://static.usrfiles.com/ugd/cc3ca9_337a63bef1984e2ea86de1d4e47d69d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24447d30b8c47828084a64ed750a70b.pdf
    • https://static.usrfiles.com/ugd/35f767_ca49e1113bf64c44917e8bdb9d87694b.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/bearing_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/bobunibojumokujawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5084/files/55285648403.pdf
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/14715289016.pdf
    • https://cdn.shopify.com/s/files/1/0440/7368/1061/files/ffxiv_40_durability_rotation.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/32720541992.pdf
    • https://cdn.shopify.com/s/files/1/0462/1303/8233/files/radanukoboxelevuk.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_off00005f7c.bin
6de8e9628b0ed6619ec395fd11b5bb9e596eb38be6a10b727fd864e3954faf8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 5464 bytes
font_01_sfnt_off000071fa.bin
78701757e4be5a0f70bcf66279b05a0b7fb5f0cae2e76a3b9ef7ad89badd1596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FA 14524 bytes

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