Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f91404ee5dcf430…

MALICIOUS

PDF

44.8 KB Created: 2020-08-23 02:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b2aa04386abcbf1563d3194ff071a0 SHA-1: e6af681f241de38558cca7e380300549da042775 SHA-256: 8f91404ee5dcf43028b7e687591eb1341b79a89ca3c7fed08fb750578cecad29
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely used to obscure the final malicious destination. The document body text, though partially corrupted, contains keywords related to 'Cnet android phone reviews', suggesting a lure to attract users interested in technology reviews. The primary attack pattern involves directing users to malicious or deceptive websites.

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=cnet+android+phone+reviews
    • http://dunufuvi.snowmack.com/uploads/1/3/0/8/130813592/sividadexotilodaxe.pdf
    • http://files.crumistuff.com/uploads/1/3/1/0/131071277/wuwikudofipisetuxode.pdf
    • http://files.taramillsauthor.com/uploads/1/3/1/3/131383771/2096190.pdf
    • http://lasososos.kirkistownprimaryschool.com/uploads/1/3/2/8/132814930/4705090.pdf
    • http://zepuwe.sub240.com/uploads/1/3/2/7/132710603/xawaboza-fubulasal-bajafasodiduba.pdf
    • https://cdn.shopify.com/s/files/1/0437/2368/6056/files/wijumuxerikokitiluwadurok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/bavuzukagojesomumirixami.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/crystal_reports_2013_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/97008189518.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/gonosokukewapujug.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/jilamugal.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/bitax.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/53690715917.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4896/files/multiplication_worksheets_grade_5_math_drills.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/boxing_training_mp4_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/1275695613.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_off000071f9.bin
1795ac3af2dfabc585a8df10feed31546d0641230a1073a4819824db0c7fc696
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 5072 bytes
font_01_sfnt_off00008342.bin
137e7605caa364d081caa668c76c04f9a47751253cddca922127b319b1bea0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8342 10284 bytes