Malicious PDF — malware analysis report

Static analysis result for SHA-256 154bffef6b2f41ef…

MALICIOUS

PDF

37.6 KB Created: 2020-08-12 08:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c060f6048a454edef10b5437e958a1 SHA-1: 567d2d5b79c560f7b1efe6d31f5b3def7045d082 SHA-256: 154bffef6b2f41ef33accc598bfa8bce3b2a9a31d7eb545a171f6f484a36d721
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes a URL that appears to be part of a link farm designed to attract users searching for specific documents. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to host or link to external 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.ru/wb?keyword=seismic%20design%20of%20building%20structures%20lindeburg%20pdf
    • http://fazabikif.levelten.shop/uploads/1/3/2/3/132303382/xifolavabo.pdf
    • http://files.woodinvillehighschoolptsa.org/uploads/1/3/1/4/131438464/roxew.pdf
    • http://files.withinneverwithout.com/uploads/1/3/1/8/131856306/xezizema.pdf
    • http://files.efungpstours.com/uploads/1/3/1/3/131398406/watudolam_japusuvijefa_xuzuma_xaposibev.pdf
    • http://files.dkgpistateomega.org/uploads/1/3/0/8/130874329/9473916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/mefiminasilowovukore.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/don_quijote_dela_mancha_instituto_cervantes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/ziletiresolad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/mofaware.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/rolax.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/fipokufezazizovitojidebem.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7556/files/batwoman_comics.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/72718986903.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/25537453768.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/wiz_khalifa_remember_you_mp3.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_off0000567b.bin
b617bf4cde140eb4f92975866af32bf0c26e83e25762abe688e08f148ab7a3d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567B 5508 bytes
font_01_sfnt_off00006910.bin
67a07bae5f8cbd3c8bf5c2d8814e4127e795cd5ee9b802a79755084e91b40463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6910 9404 bytes

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