Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b31f0ce25edf504…

MALICIOUS

PDF

48.6 KB Created: 2020-08-31 03:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9dd2f1d6ff104fcf76d35e8facd443 SHA-1: a233d515c67e2b3d176c1e966c2d9bfdec5832f9 SHA-256: 4b31f0ce25edf504ec96e5e031437df699da744dd82e89f70da565b1fb06fb06
154 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'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

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=iso%252Fiec+27005+information+security+risk+management
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/shoulder_dystocia_maneuvers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/bushnell_telescope_manual_78-_9512.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/income_tax_return_acknowledgement_form_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/51385636994.pdf
    • https://cdn.shopify.com/s/files/1/0461/9495/0295/files/nvc_affidavit_of_support_i_864_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/rufukofubizovepawe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e6e44d4e4bf4eafb1fee7e3daa17d38.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_d4f5a80261924952b7f6e7fc4fd26033.pdf
    • https://cdn.shopify.com/s/files/1/0429/2784/9639/files/nakirosogad.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/80885358817.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_off00007f02.bin
d954017c94baa349c08dd9d41103bd5fecac1fe66f78680f876c43d90175fc17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F02 5788 bytes
font_01_sfnt_off000092bf.bin
327b8e8580ea8edef86b2341799558f9b5a1eda2a387a2029f7a9a06690fc4ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 10028 bytes