Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dc955fa714b36a…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 01:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21842abc4f9214a39757f79f819df386 SHA-1: 9dab7af09fb9de74fd228b00795b186caa75625a SHA-256: 87dc955fa714b36aee8043f62373d06650ac9d622381dfba9ebf270305abe52d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to the malicious domain ttraff.com. This indicates a link farm strategy designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=jaguar+car+symbol+photos
    • http://legixofi.wadokaisouthwest.com/uploads/1/3/1/4/131437379/buvugo_zenilo.pdf
    • http://files.raygosling.org/uploads/1/3/1/8/131872105/5109240.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/convert_kindle_book_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/bonakalezifubom.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/zipinikurobiwoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/us_history_regents_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/bufoloregutawuvexova.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/unable_to_edit_in_adobe_acrobat_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/exemple_attestation_de_formation_ssi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/john_deere_rx75_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/77047833196.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/furitevixirobexuwatido.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/stamford_alternator_manual.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_off000060ae.bin
03434389504cf5b634bfedeab31865d76be297821967a03aa3bb28cc0e89d492
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AE 5576 bytes
font_01_sfnt_off0000737b.bin
a2f1290e7ef1c0500148830e166a9a5e2f1b96e896d933cf757f9d3f9f2b5e72
pdf-font-stream PDF embedded font (sfnt) at offset 0x737B 10160 bytes