Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec1f991eff43f19…

MALICIOUS

PDF

42.0 KB Created: 2020-09-10 20:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d289ae0b5a2b70eb6adfb089348bb393 SHA-1: d19f3cb9b32913c7d756fce18d07b597e941bb85 SHA-256: 5ec1f991eff43f19199595eeee6f80d92c405449d10bfeac05eda0c83f9cae59
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, suggesting an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text fragments and URLs that align with a lure to download or view potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=abordagem+policial+pdf
    • http://files.ekphrastic.net/uploads/1/3/1/8/131856076/vavonut-remataluwi-bukitumidodu-zedotogexiwiri.pdf
    • http://kagub.redt-miracle-key.com/uploads/1/3/1/6/131636745/gadefexibaza.pdf
    • http://siven.dontworryaboutme.com/uploads/1/3/1/3/131378950/magusesewemido-gaxisuravewur-mukonurar-zoxolikuweriwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7657/4620/files/skip_ad_pro_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/powder_keg_wwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/60789920824.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/bobulelitedopapizizagina.pdf
    • https://static.usrfiles.com/ugd/4a6c57_e39ceac423844b489ccc1434da27a0fe.pdf
    • https://static.usrfiles.com/ugd/a58b01_6999e0a93ae44586ab13c2808c3a7748.pdf
    • https://static.usrfiles.com/ugd/d162e3_04534073f4084d0d9369b93f0717f2ff.pdf
    • https://static.usrfiles.com/ugd/c81504_b676cfe4600c4a729f0a9dab07e26e90.pdf
    • https://static.usrfiles.com/ugd/83e24f_6ad8caf51a3e4469ac2caf8e2326e134.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_off000065e8.bin
4a786b1b21ff1f998eaeefcde9428eb023d7b6a486131477751a9bcae8e74ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E8 5428 bytes
font_01_sfnt_off00007848.bin
0665c24821b35998f7047b0fe83adaabed0ab116069fd4d072b7c1e198d06281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7848 10276 bytes

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