Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca62c04b8bdf7be…

MALICIOUS

PDF

44.6 KB Created: 2020-08-15 10:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb94290394e69f6d6846818efcf1404 SHA-1: f82d1e410df7598e67915b05734acaf3e518a124 SHA-256: 0ca62c04b8bdf7befdeae540f763a19e36ebb0961cb8a61898e3836fa150cf02
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a 'free pdf' download, which aligns with the malicious redirector's keyword. The presence of multiple external PDF links, many hosted on Shopify, suggests a link farm intended to obscure the malicious destination.

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.cc/wb?keyword=tartuffe%20free%20pdf
    • http://sinagasub.communitycreditinc.com/uploads/1/3/1/6/131606490/jepuxisemupenerupu.pdf
    • http://famidaliv.evalew.com/uploads/1/3/0/8/130814004/xazenomatenuru.pdf
    • http://files.schaefernursery.com/uploads/1/3/1/8/131872273/fubavo_woros.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/34127866774.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/66064107319.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1071/files/steel_casting_defects.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/salevoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/20538763584.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3791/files/teguzifuziberixomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8482/5247/files/collateral_agreement_sample.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/31700298005.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/29670515015.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/gadobilabejufefovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/jibiwogiputosatebasusuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/literary_periods_of_english_literature.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006189.bin
c405886b2d62880d908262d5ec9889ec35c68ef422d419d39e5a073a11d1c700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6189 4392 bytes
font_01_sfnt_off00007080.bin
6c98bf9b7fcfbe7377f744b1798d5965019753ab98f83245ff60e5009939dd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7080 11252 bytes
font_02_sfnt_off00009674.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9674 4324 bytes

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