Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec06f5eb6e74d72…

MALICIOUS

PDF

42.7 KB Created: 2020-07-13 20:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85be9d9db577b24301645e7d126387b5 SHA-1: 0b4e6af02eb8d480daa763e7d1fbd38b577941c5 SHA-256: 0ec06f5eb6e74d724eed11c7b4d8260720f034ddc69ec36708165d39324a22fc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate malicious intent, likely to redirect users to harmful sites or download further payloads.

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.com/pify?keyword=mathematical+physics+pdf+for+msc
    • http://files.emeralddriveproductions.com/uploads/1/3/2/6/132681757/pajogofikiga.pdf
    • http://files.deborahkellerrihn.com/uploads/1/3/1/3/131379236/zufalud.pdf
    • http://files.tomhumeartist.com/uploads/1/3/1/4/131453241/mujunatizovixikuxe.pdf
    • http://files.radicalphilosophyassociation.org/uploads/1/3/1/8/131856356/xarerumuguk-xereva-wilekoginusugug-fufewudatusives.pdf
    • http://files.fasndworkshop.com/uploads/1/3/1/4/131406234/8bbf5.pdf
    • http://files.carriekellyk9.com/uploads/1/3/1/0/131070452/423a0f3acc.pdf
    • http://files.spencerandsarahphotography.com/uploads/1/3/0/7/130739802/nixobibeledagopuw.pdf
    • http://files.sundownlodgeequestrian.com/uploads/1/3/0/7/130776403/8482563.pdf
    • http://files.originsofearth.com/uploads/1/3/0/8/130813764/febbf77a41af22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://duwopizemole.files.wordpress.com/2020/06/71462186445.pdf
    • https://gitorolopi.files.wordpress.com/2020/07/kititeponukex.pdf
    • https://wotilebuf.files.wordpress.com/2020/06/xotizafizawujigude.pdf
    • https://rolojitafet.files.wordpress.com/2020/07/97329350031.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/ruworezizitep.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/43696178765.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/lidananubonasujobesalefuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/31145118877.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/vujujatitedaletupij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/pajivorejawediwezapu.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_off00006a32.bin
e3cf5e2db4582a058ed0643f2fd814a26e18c4a345d330745a049fa8833af4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 5184 bytes
font_01_sfnt_off00007be3.bin
b8e87643c802c6456e7ed03682f0c46721f9c6209be51e3a4cf0bc90bfe1c62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 9800 bytes

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