Malicious PDF — malware analysis report

Static analysis result for SHA-256 812858128633142c…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 18:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f983b312e62af86bb81f1a222ec21fdd SHA-1: ee586e7833b36e7c66e2058c33bc82bc8b175ec9 SHA-256: 812858128633142cd954a5d2792aa3113a61a3ca09549b5d7d3bda5e5b133b97
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to PDFs hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or a lure to distribute further malicious content via the embedded links.

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.com/wix?keyword=voltage+securedata+architecture+guide
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/92729286349.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/71401863769.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4076/files/xafulomubajokinokozikati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68769425665.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9445/files/jef_clement_inspirerend_coachen.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/fazitarunigoxudozixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2253/3276/files/31792065416.pdf
    • https://static.usrfiles.com/ugd/b8c837_f872e80152084739b4d1b42d023644cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_568de4dcaec448ea9f98eaad08b503d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bb652bb3c4d4ab59099c395a8a9444a.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/xejanejokedaliwiwajozez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/19164186593.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/central_air_conditioning_system_download.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_off000053f9.bin
22c35a3a65980c3d803ee4bd39a95149e41a71012e42e355e279339dec2080d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x53F9 5168 bytes
font_01_sfnt_off0000657a.bin
1ddcaa5309b312703af324c5db6af562b713ddd35af7befd1788a6b163fdd85c
pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 14100 bytes