Malicious PDF — malware analysis report

Static analysis result for SHA-256 331dc5bafb5a3bd4…

MALICIOUS

PDF

42.5 KB Created: 2020-07-09 06:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78457aac13b96edfe8b3e3f0af28a8ba SHA-1: 20e6d9ebff01a54741c9bcc9f08c65d9c85a268f SHA-256: 331dc5bafb5a3bd41223a1809c518bac690e5fcf5571c42ccbcaee98367674ae
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'https://ttraff.cc/wb?keyword=aprilaire%20500%20manual'. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. No scripts were extracted from this sample.

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.cc/wb?keyword=aprilaire%20500%20manual
    • http://files.u3abroadbeach.com/uploads/1/3/1/3/131398517/44b47ac3.pdf
    • http://files.apiyauya.com/uploads/1/3/1/8/131856382/4124775.pdf
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdf
    • http://files.commsailpistakee.org/uploads/1/3/0/7/130739824/wokogabofeb.pdf
    • http://files.williamsfamilyfarms-ms.com/uploads/1/3/0/8/130813799/rorefabam-kiresuwadototi-zawiliwopilowon-xileluni.pdf
    • http://files.cailenfu.com/uploads/1/3/1/4/131437444/rutez_wubusaxofab_kajali_zuwogor.pdf
    • http://files.lscrta.org/uploads/1/3/1/1/131164231/d82f2e224.pdf
    • http://files.twoplumsdesign.com/uploads/1/3/0/9/130969048/528231836.pdf
    • http://files.surrenderedtochrist.org/uploads/1/3/2/6/132681656/wulegi.pdf
    • http://files.vikkiconley.com/uploads/1/3/0/7/130776640/siwamite.pdf
    • https://danawuwida.files.wordpress.com/2020/07/rozikekokemepusarakaf.pdf
    • https://gitorolopi.files.wordpress.com/2020/07/xivikofadalivoraxujezuw.pdf
    • https://rowejarenak237226416.files.wordpress.com/2020/06/32106911623.pdf
    • https://rovekozo.files.wordpress.com/2020/07/dufajawililuziwimojubo.pdf
    • https://niteperozis.files.wordpress.com/2020/07/noxokuririwuboridavufizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.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_off000069ae.bin
5cca4221dd6784a86486d711ba0c32a5ddb5d2ee8af09bb8b705d60825cfe493
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 4736 bytes
font_01_sfnt_off0000798f.bin
78c398ada3a874f7132055e8b518dfbc960db1309cc443c646d33a055d1aa5c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x798F 10648 bytes