Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3cd7abe578fcc3…

MALICIOUS

PDF

52.1 KB Created: 2020-08-10 01:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b357804762bda091ef8e97de7bed5292 SHA-1: 536150639caae89b3eee602e81328424dc59f8a6 SHA-256: 0c3cd7abe578fcc31f7c39277d673bf3e0c0c2dd74f67da7d6f7a7247583f0a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to redirect users to potentially harmful content or malware downloads.

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=calibre+lvs+manual+pdf
    • http://files.lec-psaa.com/uploads/1/3/1/3/131382841/936358.pdf
    • http://files.hometowncoffeeandtea.com/uploads/1/3/1/8/131857114/lepokudej.pdf
    • http://files.tampaiscebs.org/uploads/1/3/1/4/131483138/7363cf32a2a.pdf
    • http://files.secretskwadron.com/uploads/1/3/0/7/130739532/jiterutuwuwuz_zavarixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1820/6888/files/44198208046.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/bipajim.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/manixivofudemazukibogelap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/zagijuzomejeva.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/vabeliririxaxumefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/wacom_intuos_2.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/algorithms_robert_sedgewick_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/pixisunesovalogonovikopo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/59568460248.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/11636902754.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/33879418629.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/86435141923.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/98517155988.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/juralaparagojajejivod.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_off00008da8.bin
69edbe67a635f7321507bf707a9bdd3e5a489f8e7504949bad17a28b7ff6c850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA8 5292 bytes
font_01_sfnt_off00009f90.bin
e97ae8c2798874f87f9ae5c6846f060ff6ce82440c147192fe265823646f6cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F90 10424 bytes

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