Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd891d217bca9d…

MALICIOUS

PDF

33.0 KB Created: 2020-08-22 02:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a44b0e7a98680462842ea26aeb6bb1 SHA-1: ba3ff955d7c3da2a005f57cc1ecea52b2e1b6239 SHA-256: dbdd891d217bca9df87fec107b1aef5e21371c5b754163bb83eb6a993ad08926
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=beefcakes+font+free'. Additionally, it exhibits a PDF link farm pattern, with numerous links pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=beefcakes+font+free
    • http://files.vulcanproductions.co.uk/uploads/1/3/2/3/132303045/fubabo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2233/3605/files/segazifevanaso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/ruwikoxovafexiluwan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/rivumofugodad.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/fallout_3_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/girlfriends_guide_to_divorce_uncle_tony.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/lagakasokofumunavazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2726/files/bonasudajolimarutapopaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/programming_ansi_c_balaguruswamy.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/livre_pour_apprendre_le_franais_aux_trangers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/13964741728.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/52218997725.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/87025170468.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_off0000457d.bin
9b0763f36b7aea5a11336c1e59ae15fde3bde43addf79356e9c3342fc7700341
pdf-font-stream PDF embedded font (sfnt) at offset 0x457D 4956 bytes
font_01_sfnt_off0000566a.bin
4227bfe871e21aabb5bbd2288c1596c56484d9197c69b8a2cdddb73bbab39268
pdf-font-stream PDF embedded font (sfnt) at offset 0x566A 9684 bytes