Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f3fe43ea3d5e6f…

MALICIOUS

PDF

49.4 KB Created: 2020-08-20 19:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 373e241a24b4b6b226e9fdfe60e00448 SHA-1: 1c7b846ace80554e494d071137b01350ee178af1 SHA-256: c5f3fe43ea3d5e6fcfef7b4b20fc49893b0587c84daf9c10f359a291e266ddef
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'chisel and plane blade honing guide' which appears to be a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=chisel+and+plane+blade+honing+guide, which likely leads to further malicious 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.cc/pify?keyword=chisel+and+plane+blade+honing+guide
    • http://files.the-crazycucumber.com/uploads/1/3/1/6/131607010/897038.pdf
    • http://files.sitchinstudies.com/uploads/1/3/0/7/130740573/nikikuxawofuz.pdf
    • http://files.osacps.org/uploads/1/3/1/4/131438079/tunime-venuzetaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4388/0103/files/boxet.pdf
    • https://cdn.shopify.com/s/files/1/0439/3048/4904/files/chehra_masoom_punjabi_song_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/nafiruna.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/18854388109.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nawujumukupuzuwoxelojoses.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/vosoduwet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2418/files/mafovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5626/files/utilitarianism_theory_journal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/15795328894.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51507598499.pdf
    • https://cdn.shopify.com/s/files/1/0444/2108/7398/files/tybsc_cs_syllabus_mumbai_university_2020_19.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_off000082ba.bin
82c3885a2c1b9b2f9971d47f303133057d48f852b3c890dbafb9080bf702f559
pdf-font-stream PDF embedded font (sfnt) at offset 0x82BA 5168 bytes
font_01_sfnt_off0000943a.bin
fc7ecfdf43fd2ff72b4a1d14f1a9af2506015cb5d6d6d4c267130740e1378115
pdf-font-stream PDF embedded font (sfnt) at offset 0x943A 10728 bytes