Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ff3521c2205130…

MALICIOUS

PDF

45.0 KB Created: 2020-08-11 07:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7009531bf4bbf2611213d1e3c86e0fd8 SHA-1: 6dd663b2f75af6ad7b9637c0de154bcc0bf34ee1 SHA-256: 79ff3521c2205130415164a47fdbec29c10688720723d2c44a5c49e1775ec516
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'book review template pdf'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary malicious behavior observed is the redirection to a harmful URL.

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=book+review+template+pdf
    • http://files.agnieszkajaworek.com/uploads/1/3/0/7/130739450/5628614.pdf
    • http://files.brennanthefounder.com/uploads/1/3/1/3/131398094/zekoregirekexiz.pdf
    • http://files.michianadrugtestingcenter.com/uploads/1/3/1/6/131636689/9662454.pdf
    • http://files.bluefencing.com/uploads/1/3/1/4/131407469/ea3bacfd13a.pdf
    • http://mifekozex.aanspreekpunt.nu/uploads/1/3/1/4/131453574/palukofitul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6685/8408/files/9146229411.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/dowufeludojas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/xiwesofetakuzivifefazujej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/boss_tu_2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/87518899681.pdf
    • https://cdn.shopify.com/s/files/1/0443/1475/5228/files/etiologia_da_doena_periodontal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/74465376558.pdf
    • https://cdn.shopify.com/s/files/1/0430/1452/0995/files/vefepazamekebiloju.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/sojujikevivifegiza.pdf
    • https://cdn.shopify.com/s/files/1/0444/5339/6647/files/icse_maths_book_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/16206517296.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/18621003987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.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_off00007186.bin
9387d7ee6a8f71a3691bb4fdde0e91269b5cc3076655d20502b39aa0c4380c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5276 bytes
font_01_sfnt_off00008379.bin
483b05d2b8afac1dcb31c506f22b1aa84ce35b0d069014a33dc181104861f5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 10480 bytes

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