Malicious PDF — malware analysis report

Static analysis result for SHA-256 39716f65235f4926…

MALICIOUS

PDF

40.9 KB Created: 2020-08-21 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d565e69a49bb842614ebd5566b35d47b SHA-1: 2988d40e8d199794d6b4affb26d181f82583cdc3 SHA-256: 39716f65235f4926b21a744288474d25b880ca98855016aee45e2cb8877dd0e0
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, with the primary malicious URL being https://ttraff.ru/pify?keyword=canales+de+distribucion+internacional+pdf. This suggests the PDF's purpose is to lure users into clicking malicious links, likely for phishing or malware delivery.

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/pify?keyword=canales+de+distribucion+internacional+pdf
    • http://gabisavej.ballancricketclub.com/uploads/1/3/0/9/130969072/4307405.pdf
    • http://files.delightfullivingministries.com/uploads/1/3/0/7/130740368/ribonikowedesubeb.pdf
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/19207166526.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/str_to_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/507641755.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/nixuwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/4275715852.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/dubai_airport_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/donald_glover_stn_mtn_kauai_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vexib.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_off0000616d.bin
3ad338a73691d8e16f053aed6be59f46da349027cef3309bc49e353f5ebb1610
pdf-font-stream PDF embedded font (sfnt) at offset 0x616D 5196 bytes
font_01_sfnt_off0000731e.bin
c56760e0099a26f009e5bf08ba24f4aa2d7538ab7925ab5221d76fc88e68ad5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x731E 10420 bytes