Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb272b3409247d…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 11:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcc65176f808205d7599b207ceb6b97 SHA-1: dc36d83b6689cec81e009bb67b9328a7aa5026f1 SHA-256: d5cb272b3409247d79946b7720dff7fce28842a0880ca555ad5c48f4daee22e6
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, disguised as a '2004 bombardier outlander 400 free service manual', redirects to the malicious URL https://ttraff.cc/wix. This URL is flagged as a known malicious redirector. The document also contains a large number of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness.

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=2004+bombardier+outlander+400+free+service+manual
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/65401552955.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/ribikigobutuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/bolumolebumadixagisizak.pdf
    • https://static.usrfiles.com/ugd/89363e_ce14a5c79d104aa9a908ad95fc82a1d6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/dalesan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/91659703263.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/zidilakejezal.pdf
    • https://cdn.shopify.com/s/files/1/0468/1518/3002/files/57222666051.pdf
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/vazagelulekawul.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/25057792886.pdf
    • https://cdn.shopify.com/s/files/1/0438/3319/6706/files/ac_market_android_app_apk.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_off00006956.bin
b0c662d765f77f01339bab76307da5a678929d77cdb54f38f8215f0d7c32a7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6956 5636 bytes
font_01_sfnt_off00007c62.bin
a77eaa482d448dd7dc2bbc81b349f9f6e492020ebd46981a51919b32a8d8f0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C62 14516 bytes

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