Malicious PDF — malware analysis report

Static analysis result for SHA-256 042ff2e9e3c8e209…

MALICIOUS

PDF

40.2 KB Created: 2020-09-03 00:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c11122927c9c04d0bd30a8d557d92b0 SHA-1: f851687c73de7b3d61143abc31fbc045d6d3b24c SHA-256: 042ff2e9e3c8e209f26f26d559052d74131450e9e8676a1ffe9e2210deb4d455
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains a link farm and a redirector link, masquerading as a free calculator application. This is indicative of an advance-fee scam, where users are lured to click links that likely lead to further malicious content or phishing pages. The document body, though heavily obfuscated, contains the URL https://ttraff.link/wix?keyword=photomath+camera+calculator+free, which is a critical finding.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.link/wix?keyword=photomath+camera+calculator+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/mousehunt_rift_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/359037045.pdf
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/razodogudejutevuduxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/85519391302.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/86173457276.pdf
    • https://static.usrfiles.com/ugd/027f51_1dbf10844b7e4849bf61ea1491643cc3.pdf
    • https://static.usrfiles.com/ugd/225520_448360464ef04a6186d3ffbb8a88de6a.pdf
    • https://static.usrfiles.com/ugd/b48b60_c13871f8397241c5867b5965cf4dbb96.pdf
    • https://static.usrfiles.com/ugd/b97cba_12c4cfad22dd4732a5ce4d3d3fe01ea7.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/yugioh_duel_links_tour_guide_from_the_underworld.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/zamuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/avengers_fighting_game_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/29598398077.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_off00005f3e.bin
937970e0c6e5063d072463131ae50e2154c9343ec759d6ad6839c37cd277a0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 4944 bytes
font_01_sfnt_off00006fe3.bin
a0d880cddc858885161d44247cee0fee07b8455a13cba147f844702a6e8ca2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 10572 bytes

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