Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f1bcb8d8b76f04…

MALICIOUS

PDF

34.5 KB Created: 2020-08-14 14:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f482af68cf25a9c36e1aa27ec0062970 SHA-1: a1ee0749fe51a9f5b2b8ff4292522e462d63d5c6 SHA-256: d4f1bcb8d8b76f046d505ed86ce54f76733ecccebb442faf4e126e7d72b06325
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.ru/pify?keyword=naming+ionic+compounds+worksheet+answers+key' is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF files, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated 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=naming+ionic+compounds+worksheet+answers+key
    • http://files.draworkshops.com.au/uploads/1/3/1/3/131398419/d19f34ac.pdf
    • http://binewoba.molbiosystems.com/uploads/1/3/2/6/132695663/javijosifamibe_kixikiz_roneregesodel.pdf
    • http://files.wanes.com/uploads/1/3/0/8/130874480/wulopar.pdf
    • http://files.pacific-travel.org/uploads/1/3/1/3/131383771/worax_nibap_fewabiv_mezojaj.pdf
    • http://files.idaalive.org/uploads/1/3/2/6/132695870/5266581.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/gaxunidugipirigovus.pdf
    • https://cdn.shopify.com/s/files/1/0449/7866/7688/files/makita_3612_router_edge_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/55711187752.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/43787327382.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/65606490318.pdf
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/85138287421.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7341/files/56385021761.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/chapter_13_to_kill_a_mockingbird.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/21248326133.pdf
    • https://cdn.shopify.com/s/files/1/0431/1911/6449/files/mimadanegejiguzirivod.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/jitusexojeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/nakekimamodaxukuguzidasi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aec.bin
d7f9c605c503c694bc0298186b0c8a7f077500cc26d9443a63a2f2607e11aa09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEC 5684 bytes
font_01_sfnt_off00005e30.bin
db579ef2c927262576d14a8b636ce2ff48c92c73380ea96ef93c435cba68c950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E30 8976 bytes

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