Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc98766faf92a0c6…

MALICIOUS

PDF

76.4 KB Created: 2020-11-16 22:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261bf6335935ab2114868049d1522453 SHA-1: 4874684f7d17daf9e14942b41bcf8cc1a8abc85c SHA-256: cc98766faf92a0c68593c125fd092a6a21e26c934d052698b40b7ab06a153b4c
234 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 'Gamestop redeem coupon code' and embeds a link to a known malicious redirector. Heuristics indicate it's a malicious redirector and a phishing/callback lure, with ML classification strongly flagging it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into visiting a malicious site, likely for phishing or to download a second-stage payload.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/123?utm_term=gamestop+redeem+coupon+code
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/sixifufexinebodinib.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/6e61e7056e33.pdf
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/6087305.pdf
    • https://nosikofu.weebly.com/uploads/1/3/4/7/134724553/1511075.pdf
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/kemuw_domebak_nukarar.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/kobepu.pdf
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/425ad144.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/turegenujodato.pdf
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/tisiwatijew_zixilawoj_gowewoniloramu_jisokime.pdf
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/paxaxojalimidavaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kavitokolezub/nvidia_shield_tv_manual.pdf
    • https://s3.amazonaws.com/nazekisigiduz/2003_chevy_s10_headlight_bulbs.pdf
    • https://s3.amazonaws.com/mejigavukolu/rofiravedepitivuwukiwora.pdf
    • https://s3.amazonaws.com/rixevozajixezos/crystal_river_middle_school_calendar.pdf
    • https://uploads.strikinglycdn.com/files/e5aa42d7-1f82-4236-b4ae-0eae8accd390/nivalin.pdf
    • https://s3.amazonaws.com/kavitokolezub/cingular_wireless_corporation.pdf
    • https://s3.amazonaws.com/mukutud/larson_algebra_2_answers.pdf
    • https://uploads.strikinglycdn.com/files/65b2f4c9-4e15-4f13-a5fc-2033c3662a99/timex_it2312_clock_radio_operators_manual.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_off0000ec8e.bin
804573b03bddc88d433e5fc30b35639ef0260196ef437d550dc18dda6cd8c417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 5216 bytes
font_01_sfnt_off0000fe3c.bin
8954991c6a2d765946ebc136c2e07af505c7e756d81b56a945421283b3e4f852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 11220 bytes

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