Malicious PDF — malware analysis report

Static analysis result for SHA-256 005f752faa7c8c70…

MALICIOUS

PDF

53.5 KB Created: 2020-08-14 02:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 796f001bc9c7819ef198cd16f49ebd27 SHA-1: 0f525a476a8b68f85ab801f128ef7a76d3cc3ba1 SHA-256: 005f752faa7c8c701b9c1becc1e7068d897508ba6c377c6f98daa40433b41f08
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=understanding+breast+biopsy+pathology+report'. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains fragments of text related to medical reports and URLs, reinforcing the lure.

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=understanding+breast+biopsy+pathology+report
    • http://files.quintabella.com/uploads/1/3/0/7/130775490/jimutafesuxirife.pdf
    • http://riwegak.one2inspiredesigns.com/uploads/1/3/2/7/132740873/2d1bd9.pdf
    • http://files.enlightenedheartoc.com/uploads/1/3/2/6/132695493/104423.pdf
    • http://xozisugox.niratanka.org/uploads/1/3/2/6/132681670/db8f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/goxalujufurolejegamod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/8996017092.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8589/files/pelewijifokedu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/xodowilogumilijixuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/revewonaroxinimema.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/zipofejajula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/28320212309.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/tugutenezuzevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/zaterudejibogexurero.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/wuvale.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/chegg_solutions_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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ba2.bin
483b80358825324418dc1c37ff6b84c327b765b8922e681129df5a063933bc7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA2 5456 bytes
font_01_sfnt_off00009e1b.bin
585093bc895957dd8439f4a43832abdf7c631daeb69603571ec7f954dc5e5545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1B 13360 bytes

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