Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc04267c099fd30a…

MALICIOUS

PDF

70.3 KB Created: 2020-12-18 10:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d670ec28e8fad3828f29716a2d875f1 SHA-1: d2f45ada302486af720db620f810daf66cb8528c SHA-256: bc04267c099fd30a09318bc03277cfac1f10602b2fc18978042ad1a73f8419ba
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'traffmen.ru', which is used to host the initial lure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to movie downloads, aligning with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?utm_term=the+ten+commandments+1956+full+movie+in+hindi+download
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8e4594aa8f8.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5faa38433b053.pdf
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/c8a1498.pdf
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f920da9522c0.pdf
    • https://cdn-cms.f-static.net/uploads/4418972/normal_5fa36aa7dac5a.pdf
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5fc6c1583ff54.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f8df804ae41a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fcf02c7cd9942793f25531a/t/5fd5fec0acac596b0cafc445/1607859911675/matufaviletawos.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4aff9b1ed03538d13baa/1606372096662/46025008139.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf56aa3485235c86bd7507/1606375088262/jumasasufavepoga.pdf
    • https://static1.squarespace.com/static/5fc3bf9f2e34347c70560205/t/5fc559bd4f9837572090d55c/1606769085779/learn_calligraphy_the_complete_book_of_lettering_and_design_by_m.pdf
    • https://uploads.strikinglycdn.com/files/f867a7a5-0c35-4f33-bea1-7bf89f12dd48/sandisk_ssd_dashboard_1._4._1_download.pdf
    • https://static1.squarespace.com/static/5fc28a899698b02c7f2b0c7e/t/5fce2082d235d37878ee0a49/1607344259153/moneygram_places_around_me.pdf
    • https://static1.squarespace.com/static/5fc0ca7740f1034a5ca83b63/t/5fc12b873570fb44d12d0493/1606495113536/60065370400.pdf
    • https://static1.squarespace.com/static/5fced41fd131352a6a8a585e/t/5fd627d00f11661d4c2471f1/1607870417819/dream_girl_movie_online_free.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_off0000d427.bin
e70177239b6998eff029651768697e57a635679a5a0b74c546c846c975c7e603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 5752 bytes
font_01_sfnt_off0000e7b3.bin
d14d970fa9378a07dc0a1f774e9b69f08ddd36cb7df825e92e4694269ddf739a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 10664 bytes

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