Malicious PDF — malware analysis report

Static analysis result for SHA-256 5780eae268ee08cd…

MALICIOUS

PDF

52.8 KB Created: 2020-08-15 20:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82a625f74b9e3ba2f5082f2ef291fd0 SHA-1: 6098f17932c53e6bfd83d5e3e75945816cd918c1 SHA-256: 5780eae268ee08cd63dd2d6df0fc64760187a36f51446b4c9fe0fef0789b529d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The primary attack vector involves luring users to click on these links, which then redirect to potentially harmful sites.

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=colocacion+de+amalgama+dental+pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.rudysingh.net/uploads/1/3/1/4/131437085/jelodozadofoguw_vazejituwuj_roxeromamisedu.pdf
    • http://files.nmcontemporaryensemble.org/uploads/1/3/0/7/130739776/26288.pdf
    • https://cdn.shopify.com/s/files/1/0435/9487/5039/files/tasirajumoretazalobedider.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/xifuworuwitijelasaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/10757174531.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/12153028992.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/44330824197.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1960/files/mamoveladitosaravar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/8966954539.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/55837603316.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/3620374357.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/damivizudat.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_off00008ce0.bin
993eb6a15395c1a8ffafdf05478ef60db0d32ef06b3bfa62532309bab6b5f7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE0 5104 bytes
font_01_sfnt_off00009e2e.bin
c0b7c043960be374c2beae114f3b32a5a88bd4451f1b3d3d4315caf46a4668af
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2E 11896 bytes