Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0fa394abbc51da…

MALICIOUS

PDF

45.7 KB Created: 2020-08-10 18:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31dc2d22748bd53004f5e77c25703307 SHA-1: e86416903c65179402e477baa42cf5fce9488ac7 SHA-256: ad0fa394abbc51dad7e407eb823a110abd848903de6343f0cfc22cea9bb6268c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm hosted on Shopify, designed to redirect users to malicious content. The primary redirector URL is ttraff.ru, which is flagged as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=anatomy+and+physiology+for+nurses+at+a+glance+pdf
    • http://bavama.borrisns.com/uploads/1/3/0/9/130969060/tomumofipasirugun.pdf
    • http://files.gottfried-schweiger.org/uploads/1/3/2/7/132741110/4781823.pdf
    • http://files.thesanctuarysource.com/uploads/1/3/0/7/130738636/cb35f212.pdf
    • http://files.windycityknittingguild.com/uploads/1/3/1/8/131860553/kefaj-xuxorinenaw.pdf
    • http://files.rptpercussionflorida.com/uploads/1/3/0/7/130740011/7774360.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/7768242637.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/ccna_200_301_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/94892676570.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/76263807620.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6534/files/font_weight_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/jeppesen_private_pilot.pdf
    • https://cdn.shopify.com/s/files/1/0439/5086/6590/files/disney_all_star_movie_resort_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/48328767551.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3616/files/1706384694.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/14268131141.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/bsc4success_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/15882423681.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/zizazerijimajilovutepizad.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_off00007016.bin
a57f4891abbc11c81a413e52a1410bc33841f7080a321ebf8096e023007172fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7016 5660 bytes
font_01_sfnt_off0000832c.bin
c51ec0074466686cc983b81ea829493d3d448d22ef3c501e69d1c1e842eb8271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 10552 bytes

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