Malicious PDF — malware analysis report

Static analysis result for SHA-256 08198d2cd0ce00fa…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 09:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57a645ee89867de1af218231c19ad75f SHA-1: a2f9f9adbf0ed9c62d454ed6106ea2304f9e2ee5 SHA-256: 08198d2cd0ce00fa9cc3fb7e52b7e2aaadd740f8f781763720a3cfac75dc6d2a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=houston+astros+schedule+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and keywords, indicating an attempt to disguise malicious activity as a search result.

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=houston+astros+schedule+pdf
    • http://files.knightsautowash.com/uploads/1/3/0/7/130776386/8500239.pdf
    • http://files.rimatlanta.org/uploads/1/3/1/8/131872105/3955181.pdf
    • http://files.willshowstopper.com/uploads/1/3/1/3/131379567/kedebanironivu_lunexoj_nezefokidubez.pdf
    • http://bodunixol.alyshakarle.com/uploads/1/3/2/7/132741029/7697774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5868/2273/files/2504158721.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/94104373470.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/atticus_poetry_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/82906574131.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/88241575986.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pezudatilekubad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/datizofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/tudifebatozabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/lakidubexukarawodowabil.pdf
    • https://cdn.shopify.com/s/files/1/0430/2697/2825/files/nelikunatozapotikebojo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f77.bin
1dd3ebb9073988e5a3ca131cf7eec1602e9a51edf94c89df1448926a6565c831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F77 5204 bytes
font_01_sfnt_off00007122.bin
c566d54bcc83dd8e90a3bc236d99fb511186e9412df189009f8c8cd6df833291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 11312 bytes

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