Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2837f00d8c8c5d6…

MALICIOUS

PDF

33.3 KB Created: 2020-08-12 19:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2947651efb45e2e29c8235281a824a SHA-1: 594e33e80c568939d1ebecce00f318b06850636e SHA-256: b2837f00d8c8c5d6de9f05240f98c09f1ec32c6065cde584411acc699cc9cf95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This link is embedded within the document body, suggesting an attempt to redirect users to a malicious site, possibly for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body itself is heavily obfuscated, but the presence of the malicious URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.com/pify?keyword=medical+virology+4th+edition+pdf
    • http://nutizuvel.eyereeimages.com/uploads/1/3/0/8/130874284/fafupud.pdf
    • http://files.heriotwattcu.com/uploads/1/3/2/8/132814791/62cdc9a77e0.pdf
    • http://files.tobaccofreewisconsin.org/uploads/1/3/1/6/131637881/mokokiredax.pdf
    • http://files.fredoniaenactus.org/uploads/1/3/1/3/131379324/dofonenido.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/2711277316.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/29230786472.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/goripefabipajafix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/adobe_scan_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/delete_changes_git.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/8888873201.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/koluvakibepu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/94916116110.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4087/files/account_payable_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/48435214161.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/7715892507.pdf
    • https://cdn.shopify.com/s/files/1/0439/4126/5566/files/jajazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/kenatatupafivasuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/zazozol.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004719.bin
113e9738f22fd65b0ec1e7a9f2558978e18c0ebd38315f86a6d6477da2894712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4719 5496 bytes
font_01_sfnt_off000059db.bin
89a9182807705c95e803757c15fbd522d0842fabd018a2f9a48c91fdb9c974df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DB 8944 bytes

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