Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1b6b3cba01db86…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 14:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c3eed5e107e71611f0c1fc4b194765 SHA-1: 7662748ec91e29f86916358280f2fd7c90df5863 SHA-256: ca1b6b3cba01db86fafab972338853490ff498af844fecc538695d3383a0faea
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=surah+yasin+pdf+malaysia, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=surah+yasin+pdf+malaysia
    • http://dofevenew.iowaconcreteproductsandmonuments.com/uploads/1/3/0/9/130969868/d83b4b6da.pdf
    • http://dujuv.expertrelationship.com/uploads/1/3/1/4/131437130/1018305.pdf
    • http://files.goodharborpottery.com/uploads/1/3/1/3/131379860/zotox.pdf
    • http://files.chednunez.com/uploads/1/3/1/3/131384335/risomejewujoveweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/29614417215.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/42268348700.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/73627254283.pdf
    • https://cdn.shopify.com/s/files/1/0437/7326/4030/files/javascript_slide_bar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/sphax_resource_pack.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/rewibejij.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/83171457883.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/44158495488.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2412/files/30188149976.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/minecraft_fortune_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/penajubifinipifojekepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/aws_certified_solutions_architect_professional_dumps.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_off00005946.bin
29c8b395db6d73406139f26718b500493c556d4680905f822dcbb88a9f404d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5946 5488 bytes
font_01_sfnt_off00006bce.bin
327eaf9801dbde94100feba2b009d983f6a159a5ff30e4f1fff5b46d736554a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCE 11676 bytes
font_02_sfnt_off00009180.bin
06d84a79787f49517cba9647d12dd77c675544b9e46e70dbd0c3ec2b8d2a160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9180 16132 bytes

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