Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca69fe3fe52cebab…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1913e727c32cce1164ccfe30cc85fd4c SHA-1: 0827349ddac66b09119b7b1b701db8c452829cc2 SHA-256: ca69fe3fe52cebabba051977115161d579d70843eec06e46a364dc9b6ca50fa1
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links. The document body contains garbled text but includes the URL that triggered the malicious redirector heuristic, suggesting a lure or redirection attempt.

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=from+dark+to+light+belinda+davidson+pdf
    • https://static.usrfiles.com/ugd/913720_cf11250b74b848d1bd6db9d3ad682013.pdf
    • https://static.usrfiles.com/ugd/086daf_e679e3673e514cf7841dcb4e9d496d07.pdf
    • https://static.usrfiles.com/ugd/8dde66_f3737c9f684c414bb28d78d60dab08e2.pdf
    • https://static.usrfiles.com/ugd/dd4472_0a186f2c26f1472baa1036b9f4540b68.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25449f8f3d245d2bead0c1867bef2d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_babdc4933463447196e67db98e992f05.pdf
    • https://static.usrfiles.com/ugd/79cb75_e448eb81bb584028ba1245b89da98bd8.pdf
    • https://static.usrfiles.com/ugd/3d0627_96fbfcbf1ba845bfa99c460e2de074fb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/zinojufiraja.pdf
    • https://cdn.shopify.com/s/files/1/0450/8542/5829/files/case_for_amillennialism.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/electronic_ignition_system_using_contact_breaker.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/wimalomejefojexamivoluniv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/fararidasaxep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/jamifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/57609142166.pdf
    • https://cdn.shopify.com/s/files/1/0428/3455/9143/files/la_evaluacion_en_el_aprendizaje_cooperativo_johnson.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_off00005fc1.bin
89b5206daa0d85197ce780fd707be257a08f9e6af658be24121109119953721c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 5672 bytes
font_01_sfnt_off000072e6.bin
48bd7d493b5a3e580b666a3928995ac44cf17e3f1e878c64624234d54fe7df80
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E6 10764 bytes