Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31a42ccd71ca2f2…

MALICIOUS

PDF

36.9 KB Created: 2020-08-16 02:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29242eea00d093128dcca361c240ec81 SHA-1: b2d4ae43330c0d75afd3d7f84ac8d99a20311b85 SHA-256: b31a42ccd71ca2f2285556dbd71f59ed51ba9915f34eb0a4a7d5fa3d8b42811f
130 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'work word problems with solutions and answers pdf' to entice users to click on embedded links. One primary link directs to a known malicious redirector, ttraff.com. Additionally, the document hosts a large farm of SEO-optimized PDF links, many hosted on cdn.shopify.com, which is a common tactic for distributing malicious content or for SEO manipulation. The presence of a malicious redirector and the link farm indicate a phishing or content-luring attack pattern.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=work%20word%20problems%20with%20solutions%20and%20answers%20pdf
    • http://gevaz.thesouthernbyrd.com/uploads/1/3/2/7/132740720/jevujej.pdf
    • http://bikijit.daybreak-massage.com/uploads/1/3/1/6/131606490/9327458.pdf
    • http://daroboj.redcoaching.co.uk/uploads/1/3/1/8/131871991/3329421.pdf
    • http://dapiz.continualsurrender.com/uploads/1/3/1/3/131380429/6040733.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/mazasalekisupivujimesuzap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/pubuvafidozumejibapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/89239287670.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/6855188407.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/89697892712.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/rig_veda_upakarma_procedure_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/zulivozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/segapojafazilibudujek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/biodiversity_management_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/74754322131.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_off00005360.bin
ca7ba1bdd532b7883a0366d47aa003c79abdacd266dc7eb2595a4d809a16b3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5360 5592 bytes
font_01_sfnt_off00006662.bin
8f0e839bd5ad25f08974240864f6aa240f63e5de2ffb170f2b3a0b40616ce14f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6662 9472 bytes