Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de23491e778def3…

MALICIOUS

PDF

43.5 KB Created: 2020-08-09 04:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b682908e8c9488a9086a9ec8d84f65 SHA-1: b4c15c6a7d1635058a73195e409bc1545ce658ff SHA-256: 6de23491e778def32a4115531db9c3453942beb993d789b625eb3c1d3d04f46a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Causal relationship definition pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of many external PDF links further indicates a link farm or redirection scheme.

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=causal+relationship+definition+pdf
    • http://files.perwangel.co.uk/uploads/1/3/0/7/130775977/sibomuliworip.pdf
    • http://files.kobefeelingdolls.com/uploads/1/3/0/8/130814205/xuliw.pdf
    • http://files.spcervantes.com/uploads/1/3/1/3/131380728/258799.pdf
    • http://files.petportraitsbyjeni.com/uploads/1/3/0/7/130775337/meremebi.pdf
    • http://rezela.rivolirallies.com/uploads/1/3/0/8/130813528/03c21a573c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/xegisurivo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/96621477723.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/figitamijelitu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/37412939681.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/gegafogur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/dosafugidena.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/80540498091.pdf
    • https://cdn.shopify.com/s/files/1/0433/0546/8068/files/40620834240.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fa.bin
2e7be348592f68468b487a6b93ea4f7866bb5b4487d99f457225b176ee4317c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 5032 bytes
font_01_sfnt_off00007601.bin
ee967336568f77ff61a5ae04097864f25fb24cf77b94457ab20e22408cc95c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7601 2252 bytes
font_02_sfnt_off00007f68.bin
2842c1e65ff9e9722c11ec84bfeaebb79509396de0ff6b8ebb81e2ade27da450
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F68 9836 bytes