Malicious PDF — malware analysis report

Static analysis result for SHA-256 17242307f5736965…

MALICIOUS

PDF

50.1 KB Created: 2020-08-31 06:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 152c7993ce72f35532b220149713dae2 SHA-1: d0e0de84fb3be892bb2fd729e5d441b5e792ffab SHA-256: 17242307f5736965046a6af12f4b4885e6bf093c1ef15ee62abb2316a00d0188
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a '2007 jeep liberty repair manual'. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection 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.com/wix?keyword=2007+jeep+liberty+repair+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/xisumapuvo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/ada_guidelines_2018_treatment_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/exit_interview_questions_samples_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/it_builds_character_5e.pdf
    • https://cdn.shopify.com/s/files/1/0448/7141/8018/files/acute_coronary_syndrome_classification.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cae11349c0f48c1aa905d019fc1a3b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9e422887b9849548831af4a72104d98.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_8f79bc417db747b187c10cb5003ab067.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eed99d82ee74410ab42ccda4f97eaf5.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/the_rocking_horse_winner_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/mologomuwixoxesosumegerol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/kalemakojisutufefolub.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/aqua_lung_i300_dive_computer_manual.pdf
    • https://static.usrfiles.com/ugd/3ce946_268e5ccaeb41405daac202366c5300f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ead31749629042c5bea6a0dfa8203bb5.pdf
    • https://static.usrfiles.com/ugd/34e21e_512aa6e25b484fcda7f7b35350934f31.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a010.bin
bc3fe54e2f1dee6e00dc8f9d75187726d9e3ba1b91bc05be3a566acbe28c6ec3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA010 17788 bytes
font_00_sfnt_off00006bc3.bin
6735706bad5e3b6741312ef60f95ab9e14d94459f4be5e6b3c4d9a7b71d182fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 5364 bytes
font_01_sfnt_off00007de6.bin
5e8a91d4c62ef8593b8056848830f6200f072f8bf58b5da9757417ab69e7839a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE6 9908 bytes

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