Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb812b16d4a1e1d2…

MALICIOUS

PDF

67.6 KB Created: 2020-11-10 11:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576cfea6ca524f512b4b812327def089 SHA-1: 16c91c1006d31680f7ccea5a57f2f8e6a246b544 SHA-256: fb812b16d4a1e1d2f2c40cc874a47c0fc51c1dc22e4094413c74edb7fa91303a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'gettraff.ru'. The document body, though heavily obfuscated, contains text related to 'brother toner cartridges', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?keyword=tn330+brother+toner+cartridges
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fa241d2e85b0.pdf
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5fa79c7b394c1.pdf
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8d0cc97198b.pdf
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f8a3f26b3b85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fc22276-9521-4fb0-9126-1344276dae40/61328921227.pdf
    • https://uploads.strikinglycdn.com/files/869a52ea-ec05-499d-8144-3602af1ce8a8/cheat_happens_unlimited_account_username_and_password.pdf
    • https://uploads.strikinglycdn.com/files/2c097b4d-8479-4514-bec8-a9cd89a0e325/fallout_3_wanderers_edition_followers_enhanced.pdf
    • https://uploads.strikinglycdn.com/files/f01e8671-fd4b-422b-8b81-611087e2a291/home_access_ccps.pdf
    • https://uploads.strikinglycdn.com/files/d26debd1-920a-47ff-a44c-c7fac578222d/76969599191.pdf
    • https://uploads.strikinglycdn.com/files/554a14e8-0ede-4ba2-8074-fee271034f74/riwoxaboxeponuxisudepe.pdf
    • https://uploads.strikinglycdn.com/files/9263aa0c-10ca-46c8-adaf-b666da95627e/28643810589.pdf
    • https://uploads.strikinglycdn.com/files/f867568b-3d52-411b-9360-fdc4411139b3/78659785754.pdf
    • https://uploads.strikinglycdn.com/files/e635e821-64ed-4946-9908-06c2db8c04e7/rotatap.pdf
    • https://uploads.strikinglycdn.com/files/df4d8df5-a0e8-4080-bff0-d825e85e1b65/41061189169.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_off0000c9c9.bin
62d5907fba15e7ffd93a3fa079f2f8d60a078842219f5675042dc222c198ef5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 5564 bytes
font_01_sfnt_off0000dca9.bin
25462a6cd51ee2c2b5e0a201fdb85ced4914bda362e36c5590c131c5ece320f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 10980 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.