Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b5a0386aac3e0…

MALICIOUS

PDF

97.5 KB Created: 2020-12-31 07:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896f93c04e095f636bc73961cf915943 SHA-1: 46d450c36536653f7c0b298ce3f7177ba85822c0 SHA-256: 663b5a0386aac3e0df249369bb9affd724b5e6585fa8b95348bbd89732aea38f
254 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'sound equalizer windows 10 app' and embeds multiple links, one of which, 'https://traffmen.ru/strik?utm_term=sound+equalizer+windows+10+app', is flagged as a malicious redirector. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' further indicates a scam, and the ML classifier strongly suggests maliciousness. The presence of embedded URLs and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=sound+equalizer+windows+10+app
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5fb8929be14b5.pdf
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5f92a699937b4.pdf
    • https://cdn.sqhk.co/xotabuti/jdif3Or/runescape_penguin_hide_and_seek_fc.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8bcfdf97b16.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/5170291.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubifirigevi/tovenumolafer.pdf
    • https://s3.amazonaws.com/wupixufekijax/putlocker_fellowship_of_the_ring_extended.pdf
    • https://uploads.strikinglycdn.com/files/ad63a2e1-e21d-454a-ab33-d67b8e580516/89807576997.pdf
    • https://s3.amazonaws.com/jeponowon/pazumig.pdf
    • https://s3.amazonaws.com/fifomi/reporter_jobs_2019.pdf
    • https://s3.amazonaws.com/sifawekujiki/cursed_video_game_images.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_off00013ebe.bin
4f84f5c4b6ee5e87aab7b094736d5a36b53d55cf82a918321eb1534fd31deace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 5516 bytes
font_01_sfnt_off000151af.bin
f16688034ac36261cbd868e68a74c89540e4c2e0cc08f8144e69f0092e9da4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151AF 11804 bytes

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