Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92f095ce09b9bdf…

MALICIOUS

PDF

53.1 KB Created: 2020-08-09 21:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ac45cdf26c5ab835b5da71ac47b701 SHA-1: 6814f68432d55a3bd43001f25551c25b410967e6 SHA-256: e92f095ce09b9bdf0b708c5dc4319b04330586eade95f072953082b8b43cf520
154 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a link to a known malicious redirector, 'ttraff.ru', which is likely used to funnel victims to malicious sites. The document body, though heavily obfuscated, contains the same malicious URL and other links hosted on domains like 'jovaunholmes.com', 'pur-pro.com', and 'doublephorsemanship.com', suggesting a coordinated effort to distribute malware or conduct phishing. The ML classifier strongly supports the malicious verdict.

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=respiratory+system+of+human+body+parts+and+functions+pdf
    • http://files.jovaunholmes.com/uploads/1/3/0/8/130873973/818c81.pdf
    • http://watuk.pur-pro.com/uploads/1/3/1/4/131437044/molovomonibakot.pdf
    • http://files.doublephorsemanship.com/uploads/1/3/0/8/130813851/salovunopovisex.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/beowulf_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/revimelizexiforelamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/kupifipogisimuwaviz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7525/3910/files/calculus_with_analytic_geometry_peterson.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/30308650571.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/85827710593.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/420660526.pdf
    • https://cdn.shopify.com/s/files/1/0435/1528/1568/files/schroeder_thermal_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/zakoze.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/duzevowebaxojit.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1463/files/bomitesimaxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/how_to_pull_from_github_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/vokosatesudebolil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000830b.bin
ebb7c348a29062fa92a2afc776740b21409151a36a243ad9d66f9b475e22a061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830B 5496 bytes
font_01_sfnt_off00009598.bin
71b66db91071368a8c6d3daf171f97278f75455122b53d5170e70373d82000ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9598 10312 bytes
font_02_sfnt_off0000b8ce.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 4324 bytes

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