Malicious PDF — malware analysis report

Static analysis result for SHA-256 086d884e7ed43e49…

MALICIOUS

PDF

48.3 KB Created: 2020-08-25 02:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7538eb17cc0e09c248cdd536f9a3ecc1 SHA-1: b9d344596d2b432e855d9cd924fb0274cbf853ed SHA-256: 086d884e7ed43e49310856cc3a937afa4cadc64fcb058f20c481ed19b2dc3177
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious URL, disguised as a download for a game. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or SEO manipulation tactic. While no scripts were directly extracted, the embedded URLs and the nature of the lure indicate a phishing or redirection attempt.

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.ru/pify?keyword=tiny+archers+apk+unlimited+gems
    • http://rulafa.spindriftdancecollective.com/uploads/1/3/0/7/130739789/8019789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2818/5239/files/the_art_of_the_adventures_of_tintin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2633/files/78547265986.pdf
    • https://cdn.shopify.com/s/files/1/0454/3473/2712/files/black_hole_maths.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/77157981025.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/vuluravokirebipexuvoreb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/41976034802.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/24105043958.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/79642683622.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/life_death_and_meaning_david_benatar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/rewamajuwifamipotobuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/34300143495.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/lolekibu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006861.bin
cd85726dcb40ddd252276a32042a6ef533520028c7193c1aba267f88073ef980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6861 5604 bytes
font_01_sfnt_off00007b3f.bin
ed6a659ede7af03aa0940fbf145db39c8e9d04bb9aa25da592247ff7276a8587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 10524 bytes
font_02_sfnt_off00009f76.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F76 16060 bytes

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