Malicious PDF — malware analysis report

Static analysis result for SHA-256 db886bd0d81f13ee…

MALICIOUS

PDF

49.9 KB Created: 2020-08-12 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4671dcfe94116f17ef1e2225ddf8a34 SHA-1: 2048cf1d4924fb592fd8a3fbd40aa6f648ab8784 SHA-256: db886bd0d81f13ee807706f0084a025a2bb8fec18aadd07c5c84b3eab2e6c584
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wb?keyword=toyota%20altis%202014%20manual%20for%20sale', is flagged as a malicious redirector. The document body, though heavily corrupted, appears to be a lure related to a 'Toyota altis 2014 manual for sale'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. No scripts were extracted from this sample.

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/wb?keyword=toyota%20altis%202014%20manual%20for%20sale
    • http://files.jennygodley.com/uploads/1/3/1/3/131398128/2216626.pdf
    • http://files.skinboutique.shop/uploads/1/3/0/8/130874627/fbf0527.pdf
    • http://tudidid.fiberlane-outlet.com/uploads/1/3/0/7/130740112/562345.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/wukugofavopelodon.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/35880168988.pdf
    • https://cdn.shopify.com/s/files/1/0436/7443/5737/files/apprendre_francais_pour_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0446/6517/6217/files/58756353205.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/kuxoxarimigabozisasud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/kemon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5175/files/97666732110.pdf
    • https://cdn.shopify.com/s/files/1/0436/0654/0445/files/central_limit_theorem_proof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9299/1399/files/dukonubimasodatukukata.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/multiplying_polynomials_quiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604a.bin
9ebc4610d9965213f4aa559c413140758f3c705bd4043a87c8d6059ef8e3f360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 5260 bytes
font_01_sfnt_off00007219.bin
ab99fba5b8b908159bc20dd0ff021f0a9aaa51b1083293b63ed74d6e3817f3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7219 10552 bytes
font_02_sfnt_off00009678.bin
7b9d47a75a4f1e95ccaba5036c3e23d58dc3e71149bfbdbe3119ffa806d48177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9678 16388 bytes
font_03_sfnt_off0000ac5a.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5A 4324 bytes

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