Malicious PDF — malware analysis report

Static analysis result for SHA-256 68799c1a6986b088…

MALICIOUS

PDF

45.2 KB Created: 2020-07-28 09:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4800939b1980a50f86a2f768316f15ac SHA-1: 3b90afaba86a35064ecd11d2a9a2c5b5e2514a35 SHA-256: 68799c1a6986b088a7c21bfc8a48efcb321ff564d83feee69687435a20e2d59c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially harmful URLs.

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=capit%25C3%25A3es+de+areia+pdf+baixar
    • http://files.bsquarepro.com/uploads/1/3/1/4/131453917/335168.pdf
    • http://files.aldendieselandtractorrepair.com/uploads/1/3/1/6/131637255/2790132.pdf
    • http://files.christiandewulf.com/uploads/1/3/0/8/130815009/wegon_xarivaxan.pdf
    • http://files.midwestcraftshows.com/uploads/1/3/1/8/131857734/02ac2c84e2452.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/88933985985.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogudanivivakow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/tujovasuxemogipujaneze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/20264682806.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/mojegubuvebusat.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/jibabuteba.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/nepuzasamuleruxapej.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/45304012341.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/pifodif.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/funitogejix.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_off00006eae.bin
307eaba0e52483ba612ad64f1f9fc373f50f721b3b1a6cec0e6d4233b6429b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAE 5124 bytes
font_01_sfnt_off00007f91.bin
8e73b83ff6d0dc71beda78d7f4ec34cac38143b089bbfa24c070e2e6d7fb76c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F91 12636 bytes