Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd3c662adc833b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-11 17:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a7c63693a9bc4492d51cce93685faf1 SHA-1: ac803efec30f58bfb3fd4cb90ae02a7a2dd4a8ce SHA-256: 6bdd3c662adc833bc2c72cb53c2cb3885960b0b2b7c8d7be9f2dc6d743f4c606
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the same URL, suggesting an attempt to lure users to malicious infrastructure under the guise of academic content. The ML classifier also strongly indicated maliciousness.

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=theological+dictionary+of+the+new+testament+volume+vi+pdf
    • http://files.athos-studio.com/uploads/1/3/0/8/130813931/wirililabolekuxepi.pdf
    • http://files.westonathletics.net/uploads/1/3/0/9/130969204/vovelokefozidedura.pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://files.theordernj.com/uploads/1/3/1/4/131454521/964805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6229/6725/files/93998268709.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/47781255506.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/xurupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/xoboxobut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/tokak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/govazilir.pdf
    • https://cdn.shopify.com/s/files/1/0439/4778/6398/files/instrumentation_amplifier_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/nursing_care_plan_of_cva_cerebrovascular_accident_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/mri_brain_atlas_and_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/29852772564.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/94386835568.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/nordictrack_a2350_manual.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_off000085f6.bin
79afea24d547a82e4222235218d0c1c13c893a3a82e984ced4ea1016db5623f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 5772 bytes
font_01_sfnt_off00009990.bin
a94a9cfe194c2f50f02d115648833337346e6d8a2d153cde5c4d227bdd8bbd1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9990 10100 bytes