Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f77976b2f8d469…

MALICIOUS

PDF

40.3 KB Created: 2020-08-26 19:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba203bb1e3b83199d0e268b55f4407c7 SHA-1: 662d6294ac251ef162e475f46624330cd07fc87b SHA-256: 27f77976b2f8d4694906064f184cda060ce6e6859e4ea01dd6311eae99b54c87
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) that is known to host malicious content. The document body, though heavily obfuscated, contains the same redirector URL and keywords suggesting a lure for educational content. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=plant+and+animal+cells+worksheet+high+school
    • http://files.johnnysoln.com/uploads/1/3/1/8/131871648/65c028ab7240a6.pdf
    • http://files.gardaconstruction.com/uploads/1/3/1/3/131383924/wogumujeg.pdf
    • http://zogete.briccawards.com/uploads/1/3/1/0/131070420/deridi-tupenumavir-wanopedileki.pdf
    • http://delafusum.couhigpartners.com/uploads/1/3/1/6/131607062/9493304.pdf
    • https://cdn.shopify.com/s/files/1/0459/9906/3199/files/51839422627.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/radikuzekafixidas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/98378546037.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/guided_reading_books_for_first_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/xafujajidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/69717988232.pdf
    • https://cdn.shopify.com/s/files/1/0467/9850/4085/files/fdl_combat_loadout.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/67293010323.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/android_1_games_dead_target.pdf
    • https://cdn.shopify.com/s/files/1/0444/3507/9335/files/89473580080.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/73493018699.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_off00005eaa.bin
2ba09c1e647628f70e426d024d7cda77e1f7d0f8473a80c8eec93f8fa40ca49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAA 5508 bytes
font_01_sfnt_off00007140.bin
9ce7d175ad943ffaeda63e9b480970398a350b1e6e44af878759f06838dab02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7140 10284 bytes

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