Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f50d8725c980f57…

MALICIOUS

PDF

48.7 KB Created: 2020-08-11 07:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362873f15d134c3b4219f035480d7801 SHA-1: 9ea997251830e07f749b539629bb403129cc91f3 SHA-256: 2f50d8725c980f575a9d86015ef844a5cdc730e2fc450d432a27fc5fec617bcc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or phishing lures through seemingly legitimate PDF documents.

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/pify?keyword=academic+english+course+pdf
    • http://poxexeji.cheriselilynana.com/uploads/1/3/0/9/130969204/82c2c5f.pdf
    • http://files.joescornerniles.com/uploads/1/3/1/3/131383651/4730a60544d.pdf
    • http://files.adriannadougherty.com/uploads/1/3/0/7/130775867/votamisegufeme-gugurog-durorediri-faxerug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/xevabiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/ahs_season_6_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/muvoxipibogutodabawusi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1801/files/54663002610.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/9906817173.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/35266918146.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5610/files/milikumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/tizuzagugup.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_off00007f5e.bin
ecbcf8533c47c720ac6d538a213f27e11fac49aacc9f550abeb4d23f1c256b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5E 5556 bytes
font_01_sfnt_off00009216.bin
967292d3cfb86dddf7b36a4c47a6fee26dcac22d1290648b3c1f810e0b8f1bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9216 10652 bytes

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