Malicious PDF — malware analysis report

Static analysis result for SHA-256 9172d5090005c895…

MALICIOUS

PDF

46.5 KB Created: 2020-08-03 19:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1500bd15a76f141c3ee17108a5e27f41 SHA-1: 1cbf67bed9c1ac65e556170d37eb3d04c742775c SHA-256: 9172d5090005c895734146d229722c53f6ea49ecbae74915de23749b7076b05e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to other PDF files hosted on various domains. The presence of the URL 'https://ttraff.com/pify?keyword=abdominal+distension+differential+diagnosis+pdf' suggests a potential lure or redirection mechanism. No scripts were extracted from this sample.

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=abdominal+distension+differential+diagnosis+pdf
    • http://waxoj.35ewc.com/uploads/1/3/1/0/131070722/8190248.pdf
    • http://files.jambobeachbungalows.com/uploads/1/3/0/7/130775934/danobajiwefa_revananovor_fogudepatiwego_foroxamoz.pdf
    • http://files.boltworks.org/uploads/1/3/1/4/131407274/zegatu_vabepab.pdf
    • http://files.satorifloatspa.com/uploads/1/3/1/0/131071082/sofamirusepado-suwumewoja-xeruwure.pdf
    • http://files.newleaforganizingllc.com/uploads/1/3/1/8/131857071/6418065.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/mowusikoxop.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/97017223423.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/zaparugugoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/96679464251.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/zemumuxixuresur.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/39025955967.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/87575432187.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/31342075951.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/bunuvokukekederegog.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/wuguxelutake.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/24403187414.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/37625878606.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000757d.bin
3576598ab83d5fc00e5193716a2a28a4ea9d5df04a3d501681d0727e50494a7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 5492 bytes
font_01_sfnt_off0000880b.bin
8e76d0c3eba885ebc402b188d4941fc912bc9c2fa3638a0ce6b3a72907357696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880B 10744 bytes

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