Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2743650ce56d103…

MALICIOUS

PDF

56.9 KB Created: 2020-08-29 13:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3675b118775ee2a19831a8dbe7e0b68b SHA-1: 1ba43a72aa83212acc4091bfe91a459b85aa7877 SHA-256: d2743650ce56d103d65bdb546e18e147fe34adb1ea77abf571154d845a3e9387
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 firing for a malicious redirector link. The embedded URL points to a known malicious redirector, which is likely intended to lure users into downloading further malicious content or visiting a phishing site. The document body, though heavily obfuscated, contains the malicious URL.

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=aquelarre+3+edicion+pdf+descargar
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/voperamexekemog.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2633/files/6927387391.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/50073096128.pdf
    • https://cdn.shopify.com/s/files/1/0444/3917/5335/files/kewuvixuwasitoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/standar_akuntansi_keuangan_iai.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/zavuduzoduvarexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/understanding_computers_today_and_tomorrow_15th.pdf
    • https://static.usrfiles.com/ugd/b8c837_db409db4f6a241769f915350bc4ae4e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_940384b7959d48c39fa2658203273150.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac947309aaed413a945ce7c4bb124e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_84847834873444aebc223872457b6ca6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3dad27943814cc185cd685c6c2f3a63.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6454569ec054182aca7b573c3613ff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_daced44c88f0490aa54f2fb358dd2ede.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_off00009e21.bin
d10f0e76be5c3048a407d5baca32cdaedf43757b20409edfdabf2881e636822a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E21 5600 bytes
font_01_sfnt_off0000b135.bin
4078ec8ca27a2a3a66662b026848a6e4f42053fbc0485d9c448065d52f2baafe
pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 10872 bytes