Malicious PDF — malware analysis report

Static analysis result for SHA-256 192e637d839ffe74…

MALICIOUS

PDF

46.2 KB Created: 2020-08-13 17:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b65b567d68e9e0b784f840fb8fd920 SHA-1: 54ff41014bb81fb1665be8c8b445087382b0981d SHA-256: 192e637d839ffe743b8ce5c0f340904cb4922612d84c47b923731223eec867f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure like 'ttraff.com'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to create a link farm, likely for SEO manipulation or to direct users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=relationship%20between%20semantics%20and%20syntax%20pdf
    • http://wesebuwo.solightpro.com/uploads/1/3/0/7/130775274/1231772.pdf
    • http://giredov.ladysweetcakes.com/uploads/1/3/1/3/131383483/vunokun_tovutife_meramotitiwe.pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/71002883078.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/certificate_of_occupancy_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/xaborikidofexagot.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/trochanteric_bursitis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/mabotasijemobujulog.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3028/files/81265920464.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/jetekemaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/dolet.pdf
    • https://cdn.shopify.com/s/files/1/0449/7974/9022/files/medial_elbow_tendonitis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/2207215130.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/zizuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/defuwebuwukegewudo.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_off00006fd7.bin
ed2fe50fc0387d0f304c7478cd385b1d486467ac7aa4c3bdaaea822973139c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 5708 bytes
font_01_sfnt_off0000833d.bin
68486774777418ce3ab2e89fe695bdd76e0d325e0ba3e9446f7e9475a045fab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833D 12308 bytes

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