Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e8d0900cf777e5…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 14:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61fa2e1669a400fad173b98991c98c0 SHA-1: b6c0c0bb4cb28e86b81127ce4431a7296ffb5510 SHA-256: b9e8d0900cf777e5cbc92bf705e734c36febdf137c37828e864702fe436364d7
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. It also exhibits a PDF link farm, with many links pointing to Shopify domains, likely for SEO poisoning or to obscure the malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, reinforcing the lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this PDF might be a precursor to delivering a password-protected archive, a common tactic to bypass security gateways.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=amcat+aptitude+questions+and+answers+pdf
    • http://files.northwestibassociation.com/uploads/1/3/1/4/131438211/linoxebijoga.pdf
    • http://files.chinookwritingandjournaling.com/uploads/1/3/1/1/131163533/nudesokibapinexuri.pdf
    • http://files.beansplaybox.com/uploads/1/3/0/8/130873804/b1d53a9e0975.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/process_of_performance_appraisal_in_hrm.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/1290780163.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/veditebusov.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/94158543148.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/satosusowubasarapegigaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/57535341951.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/77892191374.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/pulufirajawobadixijivasas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/54591776944.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/gosaruxezas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/affinity_photo_ipad_tutorial_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006523.bin
80e54dda4919687c3cb5bd031613660f2be5fe465fb20fdf0223b4d203960dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x6523 5356 bytes
font_01_sfnt_off00007745.bin
f1feec716836a5eb30e48644b76e9e45d65499195f36244e4e049453999546ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7745 9800 bytes
font_02_sfnt_off00009883.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9883 4324 bytes