Malicious PDF — malware analysis report

Static analysis result for SHA-256 485c121c72058e10…

MALICIOUS

PDF

47.5 KB Created: 2020-08-03 18:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99fdaaebf69444203fa994ad68d32c7 SHA-1: 69139d42695d9e22bd3097d1124629666cf77493 SHA-256: 485c121c72058e10a3fc8382b73fa2538b4ff15d9e00cfa0bbff01b1de0f233b
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=book+history+reader+pdf', which is also flagged as malicious. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute further malicious content or to obscure the true origin of the attack. No scripts were extracted, limiting the analysis of direct payload execution.

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+history+reader+pdf
    • http://files.seltacoma.com/uploads/1/3/1/8/131871778/719c05fd04bd.pdf
    • http://files.jesus5.com/uploads/1/3/1/4/131438069/2439.pdf
    • http://files.whshuskymusic.com/uploads/1/3/1/4/131406960/gujetigenanaz-rifumibikafe.pdf
    • http://files.vicvacuum.com/uploads/1/3/0/7/130775557/merikog.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4176/files/73862855795.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/kelelofasavikivik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/sisexuboxonuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/mevemeramejuwamevod.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/90983089589.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/tezabijomuwige.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/cranes_short_story.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/89987517249.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2794/files/danivesov.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/4847123080.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.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_off00006efe.bin
59b8851e428e03ad8d111213652171d17b6239613bf3dddce836b459c376b00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 4996 bytes
font_01_sfnt_off0000801a.bin
6e12b2db00ae17cc77e12d2119a3861c5cde38619fab76b25da48993e8a94e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801A 10328 bytes
font_02_sfnt_off0000a31d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31D 4324 bytes

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