Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfbe4ff83824cdc…

MALICIOUS

PDF

36.1 KB Created: 2020-08-08 14:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8d76ae14baeba24f248505c3df436a SHA-1: 8d4cfb9c63383232c98ba74b1a759cf3a151c031 SHA-256: ddfbe4ff83824cdcb60826c034849e60385b45fd1c2d37a95129f85c445ab2c2
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to academic resources, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful websites through these embedded links.

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=principles+of+auditing+and+assurance+services+in+malaysia+pdf
    • http://files.garnerhealthylivingeveryday.com/uploads/1/3/0/7/130738993/4702389.pdf
    • http://files.lenazavaroni.co.uk/uploads/1/3/0/9/130969004/1114326.pdf
    • http://files.avonchambermn.com/uploads/1/3/2/6/132695663/pagaxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/mitimimijujiluviw.pdf
    • https://cdn.shopify.com/s/files/1/0448/1702/3138/files/programa_arquitectonico_de_una_vivienda.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/10586729082.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5934/files/anti_oppressive_social_work_practice_putting_theory_into_action.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nisej.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/64025835418.pdf
    • https://cdn.shopify.com/s/files/1/0441/2211/2152/files/amelie_piano_noten_fr_anfnger.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/xizixoponobokedini.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/37359688451.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/dodedebamolubimaregijudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5409/files/91594024802.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/bekivulebulipakorif.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_off00004a37.bin
f8de5e136e4e532f8cb5dfc16cf0f838ff4ca06e79d4c7e3db19ce9881e1f399
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A37 5640 bytes
font_01_sfnt_off00005d60.bin
cd67b773fbcb5eb5954b55e065e9cca8a57c77ff57de1c0214335b27e4b82e5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D60 10752 bytes