Malicious PDF — malware analysis report

Static analysis result for SHA-256 633f236ba2389230…

MALICIOUS

PDF

40.6 KB Created: 2020-08-24 17:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4baab96b3afe746cce10a06985e5e59 SHA-1: f78e260ac4702f329fe99c85466a49ea28188e9f SHA-256: 633f236ba238923098503c1ab1842c5353f92a214d7cb0d00570689ba6be1d9d
154 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 related to 'diabetes in pregnancy nice guidelines pdf' and a URL that appears to be part of a link farm, indicating a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=diabetes+in+pregnancy+nice+guidelines+pdf
    • http://sexukuz.bernadettehopkins.com/uploads/1/3/2/6/132680903/8879860.pdf
    • http://files.ollrichva.org/uploads/1/3/1/8/131871416/7593451e614be4.pdf
    • http://xawedi.jagartsupply.com/uploads/1/3/0/7/130775934/jewedok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/81590985146.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/roll20_spell_macros.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/ackerman_steering_mechanism_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/5882/2296/files/wulebatusiperejomusi.pdf
    • https://cdn.shopify.com/s/files/1/0449/2096/3227/files/lezazarukevefiwajamufino.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/89376990394.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/30591691929.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/69229990918.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/calculus_of_variations_maccluer.pdf
    • https://cdn.shopify.com/s/files/1/0434/5800/3096/files/40086395028.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0274/files/buzz_lightyear_shirt_template.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_off00005f9f.bin
255becc4bfc69b9073ecc90bd32bd74095567b7533e124098ee90625e4976c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 5564 bytes
font_01_sfnt_off00007294.bin
5dbb96dd7fa9e2b2dbcd08ba093255342e7e2261b6633fca41743958dc86ceba
pdf-font-stream PDF embedded font (sfnt) at offset 0x7294 10288 bytes