Malicious PDF — malware analysis report

Static analysis result for SHA-256 183c6b016f7a787b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-17 02:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a98d3667f08f9dd66c2df481cabcbfd9 SHA-1: 2349e8cab268570e65bc12b9c750712b9459a3ab SHA-256: 183c6b016f7a787b3b51a56fd3e18532143064721b9b2a896454946ad00a4a00
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=alphonsa+english+medium+school+uniform', is directly linked to malicious redirector infrastructure. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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=alphonsa+english+medium+school+uniform
    • http://zeporaz.encorecookies.com/uploads/1/3/1/4/131408017/konapux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/belt_conveyors_for_bulk_materials_cema.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/95129905226.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/where_to_find_skyrim._ini.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/4693453996.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/pes_anserine_bursitis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/accounting_terms_uk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/doxufisedoli.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/bamizokemuvo.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_off00005ad3.bin
9ce410c618e9dca4b698d28d678811e2af56a10c98326355eaf799c1ff109239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD3 5556 bytes
font_01_sfnt_off00006d85.bin
014210f472d3d36438cbbfa81a798a6e49cc9da0ca9ea4c911f43260fbf49de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D85 14536 bytes

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