Malicious PDF — malware analysis report

Static analysis result for SHA-256 718cc3b3fe5edb59…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 04:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f564d19b5fcad339c0f04f20fce7776 SHA-1: 6d41a6cae62f5f1b6b2151a242cd118e83055e44 SHA-256: 718cc3b3fe5edb599ac168a9aeab11b3800689cebf7482e897080023355e115e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious content. The primary malicious link identified is https://ttraff.com/pify?keyword=brunner+and+suddarth+s+textbook+of+medical+surgical+nursing+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking it under the guise of providing academic resources.

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=brunner+and+suddarth+s+textbook+of+medical+surgical+nursing+pdf
    • http://teloxejid.thegreatmanginoadventure.com/uploads/1/3/1/3/131384169/0afd5d646affab7.pdf
    • http://files.chaletalpemassif.com/uploads/1/3/0/7/130775679/vikokof.pdf
    • http://files.turbobeads.com/uploads/1/3/2/6/132681012/kalogowife-bidarag-repivepulex-jurosafatoribi.pdf
    • http://files.craigalanbrown.com/uploads/1/3/1/8/131856392/totelepopojoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/process_dynamics_modeling_and_control_ogunnaike.pdf
    • https://cdn.shopify.com/s/files/1/0434/3326/3253/files/jupoxil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0586/files/sapoxojinu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/dizimisimolisumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/leanan_sidhe_persona_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/89198703822.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/39362492290.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/16386250570.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/56541016127.pdf
    • https://cdn.shopify.com/s/files/1/0440/7325/5062/files/pukelumizanizageti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e8.bin
25a5fccdba67bf8f1a1664a04540698f7f2ab81960ddb12e9e3fb747c12cdfe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 5892 bytes
font_01_sfnt_off000077ce.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 1800 bytes
font_02_sfnt_off0000805c.bin
4b8048f5d308be2ad708533606c527b486cf3fabdd111c69702c7011c850895a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 10504 bytes

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