Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d8cbed1c1d5eed…

MALICIOUS

PDF

48.3 KB Created: 2020-09-14 23:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9152d38ed2f46c7ddd884699ce037b SHA-1: 23d362f414a3ae6f95fb0ab0a6d9ba931e1e2730 SHA-256: a7d8cbed1c1d5eed5783658e01d85064dfe38f30f966582d0161629f657cfe21
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 'https://ttraff.me/pify?keyword=rdm+guide+ffxiv'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same URL, suggesting a lure to a malicious site.

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.me/pify?keyword=rdm+guide+ffxiv
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/sepulosogom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/nijobupufixewigim.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/download_streaming_video.pdf
    • https://cdn.shopify.com/s/files/1/0463/2569/4619/files/lean_startup_canvas_word_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/luput.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/63140337354.pdf
    • https://static.usrfiles.com/ugd/3ed44c_3899a6d3f87c45a3a6563db19774dc1d.pdf
    • https://static.usrfiles.com/ugd/a2de88_480ae7fb168248fd92a394c706164666.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/97866705513.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/lizerovevumoga.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_off000080ab.bin
bcaf4ee78b52ffb8ac93dc9193a91a8227f4dc89fe0a34169fd0c7c7a916f987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AB 4848 bytes
font_01_sfnt_off0000912f.bin
9c9ec0a1fe54d55726ef302aca73539af3b2a467bca1e69ca71b4629d5d1d534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912F 10412 bytes

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