Malicious PDF — malware analysis report

Static analysis result for SHA-256 484c16db1eb9ca6f…

MALICIOUS

PDF

44.1 KB Created: 2020-08-27 13:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16fcb05240e605d43fff33567ad66b82 SHA-1: 7ab120a79a0a04e2b0ae7782321d9ab70ebfaaf5 SHA-256: 484c16db1eb9ca6f62d3f82552a8dd490fe82293580f4eae661da9ee093abc8f
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 ttraff.com. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, but one on joxekel.axciscape.com which is suspicious. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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/pify?keyword=60+%25D0%25BC%25D0%25B8%25D0%25BD%25D1%2583%25D1%2582+%25D0%25BF%25D0%25BE%25D1%2581%25D0%25BB%25D0%25B5%25D0%25B4%25D0%25BD%25D0%25B8%25D0%25B9+%25D0%25B2%25D1%258B%25D0%25BF%25D1%2583%25D1%2581%25D0%25BA+%25D1%2581%25D0%25B5%25D0%25B3%25D0%25BE%25D0%25B4%25D0%25BD%25D1%258F+%25D1%2580%25D0%25BE
    • http://joxekel.axciscape.com/uploads/1/3/1/3/131379530/mijolela_mukikalijafeme_nofodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53151925343.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/96591795040.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/fractional_and_negative_indices_gcse_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/zofijonamanisawagu.pdf
    • https://cdn.shopify.com/s/files/1/0450/5973/5704/files/list_of_acids_and_their_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/belojuvarulajumekamulomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/xusugigevewupaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/wozudunezevisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/89436957954.pdf
    • https://cdn.shopify.com/s/files/1/0454/8037/8518/files/78911793398.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/witogirodijaburotij.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_off000060a5.bin
775ffd01caf93ef88e9c7c182852ac8eaab7bbd7327a3c47bd17019757c2db6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 6024 bytes
font_01_sfnt_off0000749e.bin
2dc473593cbaf3b2d112a17a76604ec7f409fdaa723c5c53afbbe86268b909c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 14152 bytes