Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40bdb592f339b78…

MALICIOUS

PDF

56.6 KB Created: 2020-08-27 14:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f648f6c0e53cf2b5598b9fca0b339d08 SHA-1: b7c24dc414ce1dd964928274c7c054c078111ea6 SHA-256: c40bdb592f339b784fe9c6ce0dcb7fcb6b23b22fdd1bf4e0056185dd0fb10be7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an answer key for a Japanese language textbook. The document also features a large number of embedded links, many pointing to Shopify domains, likely as part of an SEO spam campaign to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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.cc/pify?keyword=minna+no+nihongo+answer+key+chapter+13
    • http://files.cflucktraining.com/uploads/1/3/0/8/130813841/407394.pdf
    • http://files.9td.org/uploads/1/3/2/7/132740511/kajoxeraxejegoke.pdf
    • http://jobijis.summernightsnetball.com/uploads/1/3/0/9/130969140/pubowizilup.pdf
    • http://files.healthgeography.org/uploads/1/3/2/8/132814680/xusib.pdf
    • http://files.supercutsindiana.com/uploads/1/3/0/7/130775023/pugolamifidesoneta.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/11219125703.pdf
    • https://cdn.shopify.com/s/files/1/0432/4140/6631/files/konstruksione_arkitektonike.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/math_first_grade_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/7193/7439/files/ariston_aml85_washer_dryer_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/43836145257.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/87488733394.pdf
    • https://cdn.shopify.com/s/files/1/0460/1688/8999/files/leather_background_hd_wallpaper_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/avg_free_trial_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/29380637248.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1554/files/zokonenafijumixigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0438/0757/2130/files/6th_grade_math_exam.pdf
    • https://cdn.shopify.com/s/files/1/0439/4313/3352/files/word_association_activities_worksheets_free.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_off00006904.bin
7352c1b7fd9a611d913865e13ed1887facbdebe930739669aa17b3cc77e16e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6904 12892 bytes
font_01_sfnt_off000093b0.bin
3648359f77ebacab60a02bf37511396c630e8d919098cdaf7225f00fb0c9f2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B0 5644 bytes
font_02_sfnt_off0000a70c.bin
ae08096cde10ce538568415f7dc06b7e0dd9dc0e45b1ab84ef3bdb60b41ea8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70C 14536 bytes

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