Malicious PDF — malware analysis report

Static analysis result for SHA-256 534f1ec407e18e39…

MALICIOUS

PDF

49.3 KB Created: 2020-08-21 05:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddc880513bd5231d071fc69d14fb1477 SHA-1: f61758dd2ef17f68b2838de0b938bdda0833a220 SHA-256: 534f1ec407e18e392fe45ed987f294d5ab178505e8d10aff45d5930df7838c29
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages.

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=linear+programming+feasible+region+worksheet
    • http://files.bettylous.com/uploads/1/3/0/7/130738892/talenuw.pdf
    • http://files.causeareaction.com/uploads/1/3/1/4/131438819/3552879.pdf
    • http://selevegov.adamdaltonblake.com/uploads/1/3/0/9/130969868/wugutegozipuzaz-jigaxemozege-mujeg-wifufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/91423178604.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/traxxas_slash_2wd_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0434/3008/4760/files/beekeeping_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0451/3356/2010/files/android_sqlite_database_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/o_nobre_alcoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9756/files/tulumamufetaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/burezulaboganaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/13787613134.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_off00007f97.bin
c9dbf7b25ae0d3f5dd2471d2f0a2931e284953a81ce723716a635a9a684ca38a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 5552 bytes
font_01_sfnt_off00009261.bin
80250ab279a10891ef137441920ee6f76e77c4fbf3ecf139b8d9eeb150ffff00
pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 11292 bytes