Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4f0cedf6301acb…

MALICIOUS

PDF

32.7 KB Created: 2020-10-23 21:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fba07fe13efe4f3c0f4d44122dd9200 SHA-1: 2b0a06b96b89c77112e92c7e7fa31b14d96861b3 SHA-256: ad4f0cedf6301acb49548da66becbd599d54d04623a7b72fe9bbc4df096ef5ab
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://gettraff.ru/123?keyword=personal+pronouns+worksheet+year+6', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to educational content ('Personal pronouns worksheet year 6') to disguise its malicious intent. The presence of numerous external links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to increase visibility and potentially distribute further malicious content.

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://gettraff.ru/123?keyword=personal+pronouns+worksheet+year+6
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f87fa0629d8a.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/niwexekeropeveteken.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/2b80a9.pdf
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/vusixekowi.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/8979937.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/pevadidobixegisazaxorima.pdf
    • https://cdn.shopify.com/s/files/1/0502/9101/5842/files/18436387751.pdf
    • https://cdn.shopify.com/s/files/1/0501/2904/3651/files/tumosuvurutujazisafojegev.pdf
    • https://uploads.strikinglycdn.com/files/16030057-c65e-45fa-82de-df664d8b8523/bimeje.pdf
    • https://uploads.strikinglycdn.com/files/e2b7684f-0e3c-434f-afea-4abb8577286f/33976482029.pdf
    • https://cdn.shopify.com/s/files/1/0440/7905/5000/files/50530697399.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/jurassic_world_the_game_hack_appvn.pdf
    • https://cdn.shopify.com/s/files/1/0493/0070/1343/files/navionics_apk_mediterranean_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3534/files/2278252855.pdf
    • https://cdn.shopify.com/s/files/1/0486/1335/9776/files/63085386935.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/75751884385.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/dork_diaries_book_11.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_off00004504.bin
ea817dd40afcce08ef525d4eaf7e8e293f4dd05da1973d6f1b729c6608d67c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4504 5320 bytes
font_01_sfnt_off0000572b.bin
f48bd53629e10d3a0be99cc9223e1a1d0382e2135e7e142984b5ba647661390a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572B 9004 bytes

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