Malicious PDF — malware analysis report

Static analysis result for SHA-256 913c679bdfdbf5a3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-07 19:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d10efa0e9ab103f03cd445ce33dd4c7b SHA-1: 0ca99681bdee7e4ab5e62520ecbaf88db0762f61 SHA-256: 913c679bdfdbf5a3a1b8782d2829dda4d244ec97f07bb8704b549ecbb7764a20
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, such as `ttraff.cc`. The ML classifier strongly indicated maliciousness. The primary malicious URL identified is `https://ttraff.cc/pify?keyword=cadaver+exquisito+pdf`, which likely serves as a redirector to a malicious payload or phishing page.

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=cadaver+exquisito+pdf
    • http://dazudaju.shopcoresound.com/uploads/1/3/0/7/130776644/kusefuniga-rosuvudezol-todonusugitir-jetexalidomodu.pdf
    • http://files.lcmcendowmentfund.org/uploads/1/3/1/4/131406060/7fd95a.pdf
    • http://tufumuxe.keliadelaide.org/uploads/1/3/1/4/131454373/28ca67c398.pdf
    • http://files.stephenwitkin.com/uploads/1/3/1/6/131606965/komunetinibolam_nidopek.pdf
    • http://files.atablecheznous.com/uploads/1/3/1/4/131482976/d1d37b22bb2c57.pdf
    • https://cdn.shopify.com/s/files/1/0451/2422/3141/files/uninstall_mono_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/3073/9106/files/92162856483.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/oxygenic_photosynthetic_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/pidoruzuzedosikovuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/memobosivod.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/bejazod.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/19620992852.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/pepesoxelotuzuwevililadad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/xupefiri.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/20175238388.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/arthritis_uk_shoulder_pain_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/bacteria_causing_food_poisoning.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_off00006530.bin
215eaf96ff713bbe7c0244a04f0af42b8c17ce4d9e33864b2ea5e86c659e14af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6530 5164 bytes
font_01_sfnt_off000076d4.bin
d273434b8149fcbac9e8f72434f5840c0d7e36647229732b75c0cfdeabb2f429
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D4 9948 bytes