Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c99eeb37bc3c22b…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 15:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5d73fa5023927e2915f4ad4191bd7b5 SHA-1: 9bf9e8956674108603b912560ebef4bae02d4923 SHA-256: 5c99eeb37bc3c22bf615b635bee4e514049b601ccc35ff600ed1fbc1ac3c7138
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 hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=lagu+rhoma+irama+begadang+3'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.cc/pify?keyword=lagu+rhoma+irama+begadang+3
    • http://dafavavu.juliahobdayphotography.com/uploads/1/3/1/3/131380213/zilufipawop_xudizurividise_nabitegamunibi_waxaxamijipugop.pdf
    • http://files.buzz4bugs.com/uploads/1/3/1/4/131438471/8342686.pdf
    • http://rigapefit.magdalenakarlick.com/uploads/1/3/1/4/131407535/3179545.pdf
    • http://files.unionvalleybaptist.net/uploads/1/3/2/6/132682528/pilidaruxofadopekupa.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/10553476472.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/jepolijivajevib.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/que_es_la_anemia_y_tipos_de_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/13432831048.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/3420319461.pdf
    • https://cdn.shopify.com/s/files/1/0438/8143/1195/files/62229433302.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/45848113683.pdf
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/physical_science_concepts_in_action_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/2174/4803/files/64922774671.pdf
    • https://cdn.shopify.com/s/files/1/0434/1006/3527/files/donawexopiwupupugote.pdf
    • https://cdn.shopify.com/s/files/1/0437/7326/4030/files/diagnosis_of_ischemic_heart_disease.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_off00005e14.bin
25b12f77c3f274ada55e9df6e8ce50fe80e8a4d53b3b4f5752e0169267c6dd0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 5276 bytes
font_01_sfnt_off00006fdc.bin
50e95a11d65b5133d6685058c6ee74167d520da7bc5a24406cb9e82036cf11bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDC 9852 bytes

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