Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ba8baff72c82a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-12 18:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2769cfa21756541dc20efb89b47873d9 SHA-1: 9fa00f5d51cd2ece3fdc6e3e3bddbedc06ca1405 SHA-256: 728ba8baff72c82a764777033eb77ff1177adce7a597ecd6db14f2b6b3655404
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. It also exhibits a link farm pattern, with numerous external PDF links, many hosted on Shopify. The primary malicious URL identified is 'https://ttraff.cc/wb?keyword=pgdca%20notes%20in%20telugu%20pdf', which likely serves as a lure to download further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=pgdca%20notes%20in%20telugu%20pdf
    • http://kovesibi.jon-morrell.com/uploads/1/3/1/4/131406082/5418583.pdf
    • http://tikivanew.tasmanissues.net/uploads/1/3/2/8/132814930/28831c711.pdf
    • http://jegozunap.drstevenjadlow.com/uploads/1/3/1/8/131856725/5102464.pdf
    • http://files.newzealandmotorcycleadventures.co.uk/uploads/1/3/1/4/131482886/guduf.pdf
    • http://files.14jdc.org/uploads/1/3/1/6/131606901/favov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/dafikere.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/69145866096.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/cambridge_o_level_maths_past_exam_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/90258972000.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/nimitoze.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/php_uploading_multiple_files.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/59406524685.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/3387044223.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/xefijuwinirumeregibaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/25361083242.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/tisares.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/80550520965.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/14902667483.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050ce.bin
169fbb060e391d99852513ff5a1b501463977f61af413666210b68ad78b2ad4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50CE 5228 bytes
font_01_sfnt_off000062ab.bin
1710c8f21bba95655be49087c15bde770b2d05ad123bac1dd5c2ef4c0d988124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 14440 bytes
font_02_sfnt_off00008fa0.bin
2c4d3f9388caeac4863e496f59355d93b2fd301cce0a63cbad432128295478e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA0 2568 bytes

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