Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa171782c184b03…

MALICIOUS

PDF

42.1 KB Created: 2020-09-13 08:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9386a87c5e0d5604bb37559c226bc118 SHA-1: 3c44100636b5ff93858f3fc542bd73ee0f9448e7 SHA-256: 5fa171782c184b03bb8df6b67f2e4a7abac73c7df18bf8e1fd0cbedaab7e374c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to malicious infrastructure. Although no scripts were explicitly extracted, the nature of the embedded links suggests potential for JavaScript execution or further payload delivery, aligning with spearphishing attachment tactics.

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.me/pify?keyword=oraciones+de+san+judas+tadeo+para+los+enfermos
    • http://mipekel.kaphc.org/uploads/1/3/2/8/132814930/ecbd104e91.pdf
    • http://pakobul.therootsofspiritualculture.net/uploads/1/3/0/9/130969684/jaderuzujugite.pdf
    • http://miposog.sharoncarrjewellery.com/uploads/1/3/1/4/131437254/1096518.pdf
    • http://files.rn-photo.com/uploads/1/3/1/4/131406222/xibasilosotelur.pdf
    • http://bisofij.infurnace.com/uploads/1/3/0/7/130775735/d4c4306c813c939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3ceeb9_ad2505acd9d94f05b284e719ed8865ad.pdf
    • https://static.usrfiles.com/ugd/c2007e_03f85c93756e4e6691eb49ed6d18b0ed.pdf
    • https://static.usrfiles.com/ugd/368de4_16f50bba7fd14da38b4ea72e68d6cb49.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/autosuggestion_bungen.pdf
    • https://static.usrfiles.com/ugd/b98abb_3a1964153f8e4527ba600223838fca92.pdf
    • https://static.usrfiles.com/ugd/7baf93_97a41c8764794c72ab3c3c258ed2c205.pdf
    • https://static.usrfiles.com/ugd/ac1638_e5025c8c1fa54fd293b7bc72ef489070.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006214.bin
b1084663982d5c7632a1677b5cdae2f60de5cdf245086407b08687dd3b3b2766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 5404 bytes
font_01_sfnt_off00007462.bin
f3e1ba8f7ebccf5db0e01e47a094485c36173cead6581dc8f5994eda65a1ce6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 11512 bytes

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