Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9035ceb6d27f3c4…

MALICIOUS

PDF

57.0 KB Created: 2020-08-10 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda5b5ca86a494f5d7152513496b4f84 SHA-1: a370e06a94b2716bad2b4edcea54b9dafc603c4d SHA-256: a9035ceb6d27f3c4391ec6b05517e7ed3d5be40566dced286840a8e7be27ae58
150 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, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.ru/pify?keyword=beltenebros+libro+completo+pdf.

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=beltenebros+libro+completo+pdf
    • http://files.miscoehillpto.org/uploads/1/3/0/8/130814172/4138176.pdf
    • http://files.leedstriathloncentre.co.uk/uploads/1/3/1/4/131406453/6874189.pdf
    • http://files.oiseaux-tempete.com/uploads/1/3/2/6/132696113/xisokumekoleki.pdf
    • http://files.nataliavidyakina.com/uploads/1/3/1/4/131454719/99ab18.pdf
    • http://files.larayesbbqsauce.net/uploads/1/3/1/6/131606260/basazoxebisevut.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/jidiwirefibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/16649219874.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/84294774754.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1477/files/amortization_schedule_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/23171319707.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/pijepawipazuwukizija.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/lewaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/fuxekivepiwit.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/2017622384.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9927/files/43524561316.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/osrs_zulrah_strategy.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
stream_005_off0000aaa8.bin
70e1ea67dfbfa2835ee5da2aeb885019580cbda4f8bc41d22c9f473f43115414
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAAA8 24552 bytes
font_00_sfnt_off00007474.bin
9637e59a3520238cf265c60ed0aca94d83eb55a9e6f23dc4ad95f7e9a74a9fb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7474 5280 bytes
font_01_sfnt_off0000864e.bin
242908afc4cdf204ec74e9754bd93bd0f52370ded217428099dfb8114066ebe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 11092 bytes