Malicious PDF — malware analysis report

Static analysis result for SHA-256 6896c4cc852c3040…

MALICIOUS

PDF

53.2 KB Created: 2020-08-09 08:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f591228b450c448a8d2cf1cea48eddaf SHA-1: 671a079850517e2acc310dd73d9fc6c58e9b8c1b SHA-256: 6896c4cc852c3040537eb993560d8533e0b9013429bfd31c22d915fe37eea5f1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO spamming tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=les+cestodes+adultes+pdf'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful 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://ttraff.com/pify?keyword=les+cestodes+adultes+pdf
    • http://pijobidiz.betterhealthyouthyoga.com/uploads/1/3/2/7/132712093/kizujoxafawilu.pdf
    • http://xetad.millomrufc.com/uploads/1/3/2/6/132682883/de72a3280.pdf
    • http://files.jept.co.nz/uploads/1/3/1/3/131380627/rixeranojuxikaveko.pdf
    • http://files.piommiami.org/uploads/1/3/0/8/130874316/79de620286e72.pdf
    • http://files.techecohome.ca/uploads/1/3/1/3/131379231/wozaborufuziwozeji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/killeen_craigslist_org.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/velegufomasorodeliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6630/files/66647835060.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/avancemos_1_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/63271502865.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/levelomuwamewotowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/95269776486.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/buku_bakunin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/mebufu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5650/files/bonethugs_n_harmony_thug_luv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/overwatch_minecraft_skin.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_off000091c6.bin
9a1148ee6ad1abf40dfd64e1fd8ae3afb41901fd2aca016141b1398b2673909e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C6 4992 bytes
font_01_sfnt_off0000a2df.bin
6003fb6048c3c4952548252db13f8669c4266008a7214b6f74e16af307c24ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DF 11408 bytes

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