Malicious PDF — malware analysis report

Static analysis result for SHA-256 773a8c3c57fcfb09…

MALICIOUS

PDF

42.9 KB Created: 2020-09-07 05:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dbf889a0373fd3a92d5742fb37ebc61 SHA-1: c43d8dbc81437d671df99c0bf467b948177c2dbd SHA-256: 773a8c3c57fcfb093914019a6d586d3f7ba8382bae0f9487a16da8509812b5a8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'gangstar game free for android mobile' and a URL that aligns with the heuristic findings. The PDF also contains a large number of external links, suggesting a link farm for SEO manipulation, which is a common tactic for distributing malware or phishing 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.club/wix?keyword=gangstar+game+free++for+android+mobile
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/10b11f_610678a434db4a2bb2ad01d05cc13925.pdf
    • https://static.usrfiles.com/ugd/1df9ea_f1e88c9d633d445c9d5a0c611a9b053c.pdf
    • https://static.usrfiles.com/ugd/c20ea7_fa5336238cdd4d8e962dc202a1c8fe66.pdf
    • https://static.usrfiles.com/ugd/8e6e76_93513f0ce9c2490697694af8d393a9c1.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/5163789335.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/85614433982.pdf
    • https://static.usrfiles.com/ugd/34ec99_b13d6512a71c43a8bc8cde5220fa3b4c.pdf
    • https://static.usrfiles.com/ugd/516793_bc061b4ab3034b398752840c2305aa54.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a1096dc2c7b4b3884b92339b833df25.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9ecb95da166493db45109e36c10740a.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_e148d7b884f646e7b200b3e7850d42aa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/expedicion_de_certificado_medico_falso.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/2968799673.pdf
    • https://cdn.shopify.com/s/files/1/0469/9226/1272/files/gezefumekovineg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6426/1797/files/88871069226.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/9952370363.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_off000069df.bin
377fe6ef19f025070af0f15f6b03873c877e3ce36795e00fb2875204b2b484cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DF 5396 bytes
font_01_sfnt_off00007c25.bin
4d44a0175e138cbe0b7ab3a36fc09dc965018ef2596eda6db6318099e9cb0078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C25 10088 bytes

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