Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac8464357ae3ace…

MALICIOUS

PDF

32.2 KB Created: 2020-08-29 13:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12b7d83d26708b984dd10e29db69081 SHA-1: 301bcad11b86638eb42e6895b89ea8a45dfa7b18 SHA-256: eac8464357ae3ace63569feda20797d4252c29d62f505db34c030f1955c4eedf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, includes a URL that appears to be part of an SEO poisoning or link farm strategy. The presence of multiple Shopify-hosted PDF links suggests an attempt to appear legitimate while funneling traffic through the malicious redirector.

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/wix?keyword=analyzing+amino+acid+sequences+to+determine+evolutionary+relationships+answer+key
    • https://cdn.shopify.com/s/files/1/0462/4695/3111/files/are_are_are_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/92346803019.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/nitir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/minecraft_server_picture.pdf
    • https://cdn.shopify.com/s/files/1/0428/6572/1503/files/22028316509.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/gulin.pdf
    • https://cdn.shopify.com/s/files/1/0437/5537/2695/files/elekta_mosaiq_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/58383301667.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/87402341548.pdf
    • https://static.usrfiles.com/ugd/b8c837_97f37fc9c1784e3aadce6cbab6f40feb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eaab494c2c649598140e8a8cbc426e2.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_off00004086.bin
5c46d86688dd03ed5c99b03916887318babc7cb736674a7d1509dd9d8bcc95a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4086 5972 bytes
font_01_sfnt_off000054c2.bin
06de70a1b789110f7ae7906a2e6455c4e6a6e77d90020620cafc2a3a684758f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C2 9000 bytes

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