Malicious PDF — malware analysis report

Static analysis result for SHA-256 da40fc6e5e2115a7…

MALICIOUS

PDF

47.1 KB Created: 2020-08-06 15:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef442dbba563b5dc62a857551e020d8 SHA-1: 5d6a0bd2cc48cda900f2819cd47fa9bb47ef8887 SHA-256: da40fc6e5e2115a70b79e8459afb622cd32d1717fb322d2f26199741851c92f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links, likely to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of a malicious payload delivery.

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=alopecia+en+mujeres+tratamiento+pdf
    • http://files.nowlunenburgcounty.com/uploads/1/3/0/7/130775151/jibabutibamepag_mifaribuvano_gixajime_vebedozuz.pdf
    • http://files.guardianpro.co.uk/uploads/1/3/0/7/130739126/delupudobavebul-xowukepo.pdf
    • http://files.sems4acultureoflife.org/uploads/1/3/0/9/130969984/feregad.pdf
    • http://rekoxogi.stlouismobilevet.com/uploads/1/3/1/4/131407005/6161826.pdf
    • https://cdn.shopify.com/s/files/1/0428/1486/5575/files/almost_there_princess_and_the_frog_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0446/6167/0051/files/sbi_group_personal_accident_insurance_policy.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/82718287702.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/34066200932.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/tijozatepoweges.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/37594130769.pdf
    • https://cdn.shopify.com/s/files/1/0437/2326/0058/files/82411350166.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/misery_loves_company_meme.pdf
    • https://cdn.shopify.com/s/files/1/0450/4656/2966/files/rectifier_basic_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/37087674063.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/xejusu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006911.bin
9566fdd48720a41cf533447bad41ce38e80ead9a629e9b07073358d0d5f1e192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 5248 bytes
font_01_sfnt_off00007ac8.bin
2727b6a6143f1beb96037d01bcbe6db3de179e7c01ac581fd9b142e9570681a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 11392 bytes
font_02_sfnt_off00009fba.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBA 4324 bytes

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