Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f8ce41a404c1de…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 18:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec34950ed5b47c298ff891743fc3f64b SHA-1: 8053c0efb11cf2d01652d6007be7a7b1a8ec6b37 SHA-256: f8f8ce41a404c1ded28f38a413c0ec4c13bb4caa732a461e4440f1513703af27
154 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bangla+quran+translation+pdf+download. The document body, though partially corrupted, contains text related to 'Bangla quran translation pdf download' and lists numerous external PDF links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. 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.ru/pify?keyword=bangla+quran+translation+pdf+download
    • http://files.essentialhealthsantacruz.com/uploads/1/3/1/4/131453871/jerojevanuta.pdf
    • http://files.teachermrbenson.com/uploads/1/3/0/7/130775384/b2d3d.pdf
    • http://files.fiorentinoguitars.com/uploads/1/3/1/3/131383456/rexapubuvez.pdf
    • http://files.peter-sloot.com/uploads/1/3/1/4/131408741/wozajet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/rakobaxovikimiwezaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/81165690667.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/dumelawomox.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/yamaha_ef1000_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/gabopadetebonumak.pdf
    • https://cdn.shopify.com/s/files/1/0434/1864/8732/files/56162663206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxupajajivamuwiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/kodamedifijipopofowiged.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000514f.bin
15f9f26ef86c728638c3398db9c41eab66773a800f566ace9fabd3bb7bfddbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x514F 5476 bytes
font_01_sfnt_off0000640d.bin
bb64ee371bfb3ffc1f113eed97dbf04393ebdd01fdc755390382d12f2c6b5dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 9864 bytes
font_02_sfnt_off00008621.bin
c90ffc453fcfb80afe767f26a851e41bd2fce9c8d0779689372365f0e158ca56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8621 16340 bytes

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