Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f21bbed3b0d9351…

MALICIOUS

PDF

32.5 KB Created: 2020-09-01 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e60f279439feb963c54921b9dc3d0190 SHA-1: a5342a8377383b76180b4b1bab752c662ae29db4 SHA-256: 8f21bbed3b0d9351f04ce2d8f7e43893afd742a57819c31e5b8e3a5f9bce12d1
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as a manual for a whirlpool refrigerator. This indicates a social engineering attack aimed at directing users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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.cc/wix?keyword=manual+for+whirlpool+refrigerator+wrs325fdam04
    • https://static.usrfiles.com/ugd/b7082a_401925e25aea49a9919d6200d44ccef5.pdf
    • https://static.usrfiles.com/ugd/48d9a1_09b1dfbeae6249e3b5158ccca7ee3c58.pdf
    • https://static.usrfiles.com/ugd/fd3290_1bf4712003fb48539569af31cb6f5eda.pdf
    • https://static.usrfiles.com/ugd/b8c837_7331cb75466f4d14ab4eec207a33c1d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_50199653541b47a692d79a1b27ef0e76.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/kubuluxij.pdf
    • https://static.usrfiles.com/ugd/b8c837_729f1392a6704275a923f1451ad5518e.pdf
    • https://static.usrfiles.com/ugd/822ecd_c0c36e120a9b470c9613aa1d4c867657.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/how_to_jailbreak_apple_tv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1801/0274/files/mortal_kombat_4_n64.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_off00003f9b.bin
37727338c50f579b975d47eee5e928d24f504c4f7b29a865d8ac735b73b56768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F9B 6204 bytes
font_01_sfnt_off000054ba.bin
8faa049c99e0a868ef2ecd4e34080600b7b44e0844d52bdd937f98d66771752c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BA 9520 bytes

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