Malicious PDF — malware analysis report

Static analysis result for SHA-256 d068c145d1246747…

MALICIOUS

PDF

39.7 KB Created: 2020-08-07 08:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ffe5b0affc78cd78fea08b5e7fe617 SHA-1: ce06304e43a52401374dea7ff8d54cba4d636d49 SHA-256: d068c145d1246747302ea1253a3277936fdc7575ccb2f0cb8e3831b6a3bb5017
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent link, 'https://ttraff.cc/wb?keyword=convert%20pdf%20to%20csv%20api', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the malicious intent.

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/wb?keyword=convert%20pdf%20to%20csv%20api
    • http://files.mskenny.com/uploads/1/3/1/4/131454151/lagofurose.pdf
    • http://files.thundercounseling.org/uploads/1/3/0/7/130775249/1486454.pdf
    • http://files.arthurkeeganbole.com/uploads/1/3/0/7/130739945/1182362.pdf
    • http://files.chitchattherapies.com/uploads/1/3/1/4/131437657/5e55d9608a1ca9a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/cattell_iq_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/dazebeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/4006/files/malayalam_calendar_2020_january.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/71622604653.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/causes_effects_and_solutions_of_land_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25424470269.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/55036727099.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/41307008897.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/anchovy_pizza_osrs.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_off00005d8e.bin
fe507144216706648ce3512f8223b7891cb15a63d9e69d2f3b255be360865756
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 5080 bytes
font_01_sfnt_off00006eeb.bin
510f4e9fc2daf1afc091b56642667c2abcbc2a9968900b23f19277ef225f1872
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 10416 bytes