Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfbce37311d8515…

MALICIOUS

PDF

85.1 KB Created: 2021-01-13 16:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43371fe758cce775a20444defe4201c6 SHA-1: bf1d4e9cc6c518b4175494d31b896e213615b05b SHA-256: ecfbce37311d8515d76cb1072d9d387ed0e0179eed899d2881416da44492881d
254 Risk Score

Malware Insights

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

The PDF contains a link farm and is flagged as a malicious redirector and an advance-fee scam lure. The ML classifier strongly indicates maliciousness. The embedded links likely lead to a second-stage payload or phishing content, aiming to exploit the user's trust by offering a fake download. The ClamAV detection further supports the malicious classification.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://gettraff.ru/123?utm_term=economics+today+18th+edition+pdf+free
    • https://cdn.sqhk.co/rapowipijes/FkaUxjc/word_family_activities_for_1st_grade.pdf
    • https://site-1224368.mozfiles.com/files/1224368/cartoon_wars_gunner_1__1__1_mod_apk.pdf
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/6253358.pdf
    • https://cdn.sqhk.co/bitizulokiva/p75NZha/pusukusa.pdf
    • https://cdn.sqhk.co/kilatelazobe/Xhfgeji/dragon_bubble_shooter_games.pdf
    • https://cdn-cms.f-static.net/uploads/4421788/normal_5fb8a91680b34.pdf
    • https://site-1167947.mozfiles.com/files/1167947/62328780280.pdf
    • https://cdn-cms.f-static.net/uploads/4476002/normal_5fc014626182a.pdf
    • https://site-1175154.mozfiles.com/files/1175154/3d_stack_ball_blast_helix_blast_crash.pdf
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5fceb79f5f2c0.pdf
    • https://cdn.sqhk.co/raxoxawupej/SjbgiqN/pokimumexowolekajunev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010f44.bin
6a2a3f6888546a9fdc5189013b6d016eae6576d18b6dabc885d642bcf1928f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 5668 bytes
font_01_sfnt_off0001227f.bin
2f0a33dfc59e9e35fd4b164ea5d8da1afd7562c772ba1b673937de4ad63a0fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 10808 bytes

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