Malicious PDF — malware analysis report

Static analysis result for SHA-256 17be9d85ca5e089f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-25 01:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc34ddd980f966f855ecd134ff35cda4 SHA-1: dcfd1d3898d73da0fc3183852087aa96d1d883a8 SHA-256: 17be9d85ca5e089f45208c73835b11db59597212d6362ede181e4e00b19c5435
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of these links, 'https://ttraff.ru/pify?keyword=el+liberalismo+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the PDF's primary purpose is to redirect users to malicious infrastructure.

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=el+liberalismo+pdf
    • http://files.jerryday.org/uploads/1/3/1/0/131070207/ninadoxev-gixubazuvipib.pdf
    • http://files.saltcityvolleyball.com/uploads/1/3/1/4/131408432/e3fe11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/5607/4645/files/jobebiwemujafos.pdf
    • https://cdn.shopify.com/s/files/1/0438/8261/0843/files/obelisk_risk_of_rain_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/38876507681.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2778/files/authoring_software.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/eft_0._12_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9136/files/setomulofudaral.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/29794842493.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/33338714226.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/emulateur_ds_android_telecharger.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/8975588219.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7850/files/how_to_report_intraclass_correlation_coefficient_apa.pdf
    • https://cdn.shopify.com/s/files/1/0441/1061/0584/files/sandvik_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/sons_and_daughters_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/49277803150.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_off00006330.bin
1f39b6e843dc0049febbe9855ebc841ba8552b61f7d385e23fb64c732f2fd2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6330 5284 bytes
font_01_sfnt_off00007504.bin
d59f8eb6b665a9e171597b0f4a5f5970194844dd7a455feec0f428e26e396722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 11076 bytes

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