Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bed957bbd914be…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a2b0f50e027f09aeb9985257d9949e SHA-1: ad3dcfce6c0d0123fd78a29ec2e071f77c52601c SHA-256: 40bed957bbd914bef0f2a61b8e710a2fca3f36f20cfc22d68d21863813e5eeb1
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a malicious redirector link, and another noted a large PDF link farm. The document body, though heavily obfuscated, contains the malicious redirector URL and several Shopify-hosted PDF links, suggesting a lure 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.cc/wix?keyword=valve+75+paris
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/penetrating_keratoplasty.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixozuxixewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/32691660594.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/sigijodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6314/files/72196156240.pdf
    • https://cdn.shopify.com/s/files/1/0453/2440/2843/files/developmental_frame_of_reference_occupational_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/vivunuviwodom.pdf
    • https://static.usrfiles.com/ugd/b8c837_3af5d69f79524033a29d31b85a9af94a.pdf
    • https://static.usrfiles.com/ugd/df4650_22146cfd0354462ea99dbd635fc9e4f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b07d3eac391948c796f90ed31232e411.pdf
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/examen_de_articulacion_de_sonidos_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/95929123708.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/android_enable_usb_debugging_from_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0433/8057/2321/files/jagevowutel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5175/3365/files/cheppave_chirugali_movie_bgms.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_off00005eb1.bin
c6781e201a6dd680dd55d85b73e720d4bba43eac456898bb5151f09640cf2059
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 5044 bytes
font_01_sfnt_off00006ffc.bin
3aba28d63019566fd2078b0e4e4e102c44191ce69cd10bcdf2f300014a78bf83
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 10472 bytes