Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca7c1bee8037f39…

MALICIOUS

PDF

64.7 KB Created: 2020-08-16 10:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68e5f3da27800efd66daed6d5bc91b8a SHA-1: 31d851a740d28d83f010a69220973c89038623d5 SHA-256: 8ca7c1bee8037f393130c68742a209988e0166e838fc0c0d1722612fab013994
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.ru, which is disguised as homework answers. This suggests a phishing or scam attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with a malicious document designed for redirection.

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/pify?keyword=world+history+homework+answers
    • http://rudomame.lastangelstattoos.com/uploads/1/3/1/6/131606000/6cadf82b2.pdf
    • http://dixat.nathanelequin.com/uploads/1/3/1/3/131383982/d3cbf.pdf
    • http://files.dellsstp.com/uploads/1/3/0/7/130739376/4613901.pdf
    • http://files.oceanetterrastudio.com/uploads/1/3/0/7/130739772/gimisu.pdf
    • http://files.peaceablemarket.com/uploads/1/3/2/6/132695278/6913275.pdf
    • http://rudomame.lastangelstattoos.com/u
    • https://cdn.shopify.com/s/files/1/0431/8271/9136/files/lopukajidamuxopor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/bscic_job_circular_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/fufonasovilepedun.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7038/files/xelitivev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/76976024768.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/repobowokarama.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/3079571462.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/73780448481.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/how_to_start_a_tshirt_business_with_no_money.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_off0000a9c3.bin
77ebce54a4e38ce20baa5d4afd132974f5c1766699beb14cd7edd5e0bcd6e968		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C3 5336 bytes
font_01_sfnt_off0000bbdf.bin
f5f0e614b1b68f5d9c9f647c2fe7fc13e5044a5efa636825f2928319ebdba449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 10676 bytes
font_02_sfnt_off0000e02a.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 16204 bytes

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