Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a9f8ecf2e27a0d…

MALICIOUS

PDF

65.0 KB Created: 2020-08-08 12:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c8c6d07509fbd18ce07157654d71418 SHA-1: f05950c887a86261f1637e32c1c560614028edb0 SHA-256: 07a9f8ecf2e27a0dff026d9c1afed243de2791b6b4dfe2f2a2a0137193c38450
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=introduction+of+differential+calculus+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its role in directing users to potentially harmful content.

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/pify?keyword=introduction+of+differential+calculus+pdf
    • http://fogojaso.thedevilskaiju.com/uploads/1/3/1/6/131637881/nonumal.pdf
    • http://files.wicknsudsbydino.com/uploads/1/3/1/3/131398573/8728590.pdf
    • http://files.monorailespresso.com/uploads/1/3/0/9/130969440/wexexoxibesuk_gazexiwab_jukefimalome_kevidudukurap.pdf
    • http://bozepez.goodwinbiotechnology.com/uploads/1/3/1/4/131406893/nibisezinuwulomuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/94122496046.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/85297630894.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/androcles_and_the_lion_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/xakusokerakimimebojuviw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/66741825591.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/83752130971.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/79322692539.pdf
    • https://cdn.shopify.com/s/files/1/0434/1180/0220/files/diet_after_gallbladder_removal_long_term.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/kril_tsuroth_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3496/files/zodenem.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/jinamituzij.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0ba.bin
14f23a6f7ac431732e323beabc4ca311d317117542f4ac566833fe6143f633bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BA 5088 bytes
font_01_sfnt_off0000b216.bin
21352162c40da16dbb971b43d672154abc51f0a32d93877a5fe6976378bf9648		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB216 14936 bytes
font_02_sfnt_off0000e13f.bin
c86dd2e8eb9073f5525c3b0ae269a7213f91b44edbf915aca2fe1d7e9d6d56b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16144 bytes

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