Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9cb2bf1009ba20…

MALICIOUS

PDF

41.2 KB Created: 2020-09-01 07:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5fc4e93448359118cea63816b6a0cb SHA-1: d6d693beba285756d9a932f1505298ed30dc64a5 SHA-256: fd9cb2bf1009ba20146e0282639fc1d048d6fb8927f5dd84f02f06d68f2d350c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.ru/pify?keyword=lagu+akhirat+selamanya', is flagged as malicious and likely serves as a redirector to further malicious content. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious redirector URL is the primary indicator of compromise.

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.ru/pify?keyword=lagu+akhirat+selamanya
    • https://static.usrfiles.com/ugd/68ec51_1f8fbc9fb53c4820b9fb70d0986a7de2.pdf
    • https://static.usrfiles.com/ugd/86319b_779263af57ac4ef5b1332cf236b2f20e.pdf
    • https://static.usrfiles.com/ugd/b91566_0dd5a3a9cb1542f3a311aff65c463e6e.pdf
    • https://static.usrfiles.com/ugd/d775a9_f51f0a87a47746b6b58c79da52714805.pdf
    • https://static.usrfiles.com/ugd/8cbfce_79d6781a9ccc41da8a2df683c728c78c.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3302/files/47648191607.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/74917016009.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/movie_box_for_ios_9._1.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/gorowolidusuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/86164480123.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/kawojizepatedefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/donugasajaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/wumelin.pdf
    • https://cdn.shopify.com/s/files/1/0459/2658/0375/files/geethanjali_new_movie_naa_songs.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_off000062c6.bin
8aa65b9cfbc564b01156a9bed5f4b3022cd1f98d7b2f45a3900afd8af756ae57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C6 5204 bytes
font_01_sfnt_off0000745e.bin
3528ede18da65f0771c9928f7a825b224b67fd5de5cffc4f471af434a6fb65d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745E 10472 bytes

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