Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd1d2aae6d18fb9…

MALICIOUS

PDF

62.4 KB Created: 2020-08-21 15:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef30ccd2a3d9a075ed0baa9e0033edcb SHA-1: 2b5a531c7307fdaae176f28e783b754915c1f3f2 SHA-256: 6cd1d2aae6d18fb92dc0e47b56ba38a1d80715fd8a79c1f23b0cbd6d89fa3013
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. One prominent URL, 'https://ttraff.ru/pify?keyword=wow+iron+ore+farming+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature as a guide. The ML classifier strongly indicates maliciousness.

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=wow+iron+ore+farming+guide
    • http://files.prospectdems.org/uploads/1/3/2/6/132683267/nixanugazisisag.pdf
    • http://files.mamzette.com/uploads/1/3/1/4/131438658/4fcf1180dde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9045/2387/files/72310093920.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/2164973979.pdf
    • https://cdn.shopify.com/s/files/1/0452/7947/7921/files/70214823111.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/best_editor_for_mac_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/dipatisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6313/9733/files/reducing_dpi_of.pdf
    • https://cdn.shopify.com/s/files/1/0458/3289/6675/files/florida_civics_eoc_practice_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/fuwijezirel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/sinoweruxoteziwafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/pmp_formulas_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/32367872170.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/35448802457.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/libajite.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_off0000b6e6.bin
f3bc4cf15ee930128ab1af63d56455d90997bae2ab833b07ba276e52bc99496d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E6 5120 bytes
font_01_sfnt_off0000c853.bin
ba84c79113b5d3df4b677f30cb061bdb4f667284d7ce819bbaa36d7d08c00777		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10568 bytes

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