Malicious PDF — malware analysis report

Static analysis result for SHA-256 888ec02eaa9e99c4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-25 21:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dccab43e620715514e1e0effba6ccb81 SHA-1: d21bf8e7ef3ea8f082ebfd68aa3ad3f6b0dbe540 SHA-256: 888ec02eaa9e99c478a64e9acb4e2331c9b0f60e022fb5ea75d2150ca11c9651
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. The document body, though partially corrupted, includes text related to 'Pmbok 6th edition' and the malicious URL, suggesting a lure to download a resource. The presence of a link farm and a high ML classifier score further support malicious intent. No scripts were extracted, but the primary attack vector appears to be the malicious redirection link.

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.com/pify?keyword=pmbok+6th+edition+t%2525C3%2525BCrk%2525C3%2525A7e
    • http://rokeziw.chulavistachamber.org/uploads/1/3/1/4/131483281/dinikemupuzoj-nivujaguge-gewajepixab-fuvezamunojev.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/pixutorelejapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/52444966085.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/63789499629.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/how_to_use_voicemeeter_banana_with_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/ruzikofufekidigokomivenur.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/blend_collage_app_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/across_the_stars_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/46541049900.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/best_in_slot.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_off0000683a.bin
78a840c41d8554388292f2defa73fec6c5a52924143a905d28e1d5786db7a180
pdf-font-stream PDF embedded font (sfnt) at offset 0x683A 5304 bytes
font_01_sfnt_off000079e4.bin
cf84a719be2270a9909646e4a2e29b311e3b1ec1429f3b5de56f80e4d97c0e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 10488 bytes