Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e78b034b9997113…

MALICIOUS

PDF

40.9 KB Created: 2020-08-11 19:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d819c7a23bd027bbea8a76460b2f146 SHA-1: b4a3d080f58dc39a368feef01d67a311d954881b SHA-256: 4e78b034b9997113ab0c5158b9a3aa4279a8d17fd115920aeee636924695bb37
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was identified as malicious due to a critical heuristic firing for a PDF redirector link. It contains a mass of external PDF links, with the primary malicious link pointing to `https://ttraff.ru/wb?keyword=the%20ultimate%20chess%20puzzle%20book%20pdf`. This suggests a phishing or scam attempt leveraging a link farm to distribute malicious content.

Heuristics 3

  • 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.
  • 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.ru/wb?keyword=the%20ultimate%20chess%20puzzle%20book%20pdf
    • http://files.romanstravelwithcare.com/uploads/1/3/1/4/131453005/bajubakugu.pdf
    • http://xujexiso.qcfamilymartialarts.com/uploads/1/3/0/8/130813054/78267ab9c.pdf
    • http://files.pegasusmodelclub.com/uploads/1/3/0/7/130775014/5563903.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/0/131070851/wunamotuleze.pdf
    • http://files.itshoursunlimited.com/uploads/1/3/2/6/132695352/wesomolofibed-lirifa-sukowuxamodo-regetefiseza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/43826249764.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/zuduwipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/72830587986.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/how_to_delete_messages_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0910/files/29391150289.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/82216709552.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/restore_disk_image_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/venorisexeli.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6370/files/69617338384.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_off0000618e.bin
121cc9eac0991bce1a9f80a8de4d057dfb5e2216caeb6da72676a53b00ae5221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 5504 bytes
font_01_sfnt_off0000742b.bin
89b3b21c0a49bdc769df987ad907f33dd9a2dd639f3884506a579ab4667babbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 10088 bytes

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