Malicious PDF — malware analysis report

Static analysis result for SHA-256 913fd499aff08fae…

MALICIOUS

PDF

40.5 KB Created: 2020-09-04 19:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135fe0489f12c66260d898becc77e387 SHA-1: 3b87930ab4f083ccfea8cac22128d300578131b4 SHA-256: 913fd499aff08faeca131a06532282cdb37340e9c0a9d623fc8b766ebcfbbf87
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.me/wix?keyword=video+lagu+bungong+jeumpa, which is likely used to redirect users to a phishing or malware distribution site. The document body is heavily obfuscated and contains embedded links pointing to a large number of PDFs hosted on static.usrfiles.com, suggesting a coordinated effort to distribute malicious 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.me/wix?keyword=video+lagu+bungong+jeumpa
    • https://static.usrfiles.com/ugd/b28ae2_49d10b4e7e434bb1ba87e60b92e9d7d2.pdf
    • https://static.usrfiles.com/ugd/ffe0d3_fb5324565d7241d0b956f0a8f2d06df6.pdf
    • https://static.usrfiles.com/ugd/d2b720_96df67acee35405b87d024b3a6224fbf.pdf
    • https://static.usrfiles.com/ugd/d2057d_a97d1c542e5944cc91f7a44e7accad16.pdf
    • https://static.usrfiles.com/ugd/08fe48_1bfca8b630314a809f702c64c3f6744c.pdf
    • https://static.usrfiles.com/ugd/f515ca_50a9b3f42ab34de68f4b59869eb3a8e1.pdf
    • https://static.usrfiles.com/ugd/d017d5_362b9fa3cc3245a18693384e8e2e02b7.pdf
    • https://static.usrfiles.com/ugd/fa32a6_40c5cb46b8374849a74687dfbbf4f429.pdf
    • https://static.usrfiles.com/ugd/a4e402_3cbfb069715a4eebb0509e5077c675d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_15c0caa4221442ed918e8de10762ddd3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/69333088408.pdf
    • https://cdn.shopify.com/s/files/1/0433/1995/1513/files/22482400800.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/mini_international_neuropsychiatric_interview_italiano.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006025.bin
6aa6c914dcbeb08244b1d9ac101e493d8413bf11c6f070d7c4bb0117b6f6ba6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 5188 bytes
font_01_sfnt_off000071c1.bin
8a07f296815ab23fdd6357c22cc43bfd014c36446fbdd8317532ae57a04c2f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 10656 bytes