Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24fdc36c030ef45…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 12:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda7c357883ff6d92293116333b6fd14 SHA-1: 4be8c4631ee6ac2f649fbacd5ec6962b3eaba302 SHA-256: c24fdc36c030ef458873f364a8b58e7e26580b104251236e0c6a0719ffc9cb70
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a URL that is known to host malicious content. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the document's primary purpose is to trick users into visiting the malicious redirector, likely as part of a phishing or malware distribution scheme.

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=adverse+effects+of+vaccines+pdf
    • http://files.omshantibalancedliving.com/uploads/1/3/0/9/130969535/1b3a9726.pdf
    • http://tafut.blackandblueeaston.com/uploads/1/3/1/4/131437736/kevinanawuvomujiboj.pdf
    • http://files.artsypartync.com/uploads/1/3/2/6/132695339/dd183.pdf
    • http://narimu.jessiesfitclub.com/uploads/1/3/1/6/131637016/bafuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/58114996157.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8632/files/8822870347.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/zigomozixam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1676/files/gexivogoveg.pdf
    • https://cdn.shopify.com/s/files/1/0430/1419/3311/files/28476642686.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/81755782799.pdf
    • https://cdn.shopify.com/s/files/1/0431/3881/0010/files/99499465135.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/hazardous_waste_management_journal.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/6741514737.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/merriam_webster_english_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7358/4793/files/igcse_complete_chemistry_notes.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_off000061ab.bin
aaaa3acf4375f5769b172079a9f08fce5dc214abdb89050967d23d5661bc8cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 5168 bytes
font_01_sfnt_off00007359.bin
b7fcd1e2507a9fbfe43c553e2d6b628e1f38effb1f038c9cc417a027be2345e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 9952 bytes