Malicious PDF — malware analysis report

Static analysis result for SHA-256 820860a28c1a0659…

MALICIOUS

PDF

41.0 KB Created: 2020-08-11 04:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a181ef3c51b040818f42e77988074e13 SHA-1: 94412326da2595e444df932a2e46c3ae264419cf SHA-256: 820860a28c1a0659223c1f28493208d0187b7a1dd38b58a4d6539bd0a72a0089
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.cc/pify?keyword=guns+n+roses+paradise+city+tab+pdf', is identified as a malicious redirector. The document's structure and the presence of numerous links suggest a link farm or redirection tactic to lead users to potentially 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.cc/pify?keyword=guns+n+roses+paradise+city+tab+pdf
    • http://files.triberoastingco.com/uploads/1/3/1/0/131070362/wegarima_kadupaw.pdf
    • http://files.newarkrotaryclub.org/uploads/1/3/2/6/132681342/lalosaxuzexaw_sogesomid_sazukifi.pdf
    • http://files.wanderersmagic.com/uploads/1/3/1/6/131606268/wobekemiliji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/warusatotepufaxerer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12584167006.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/32884014267.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/nusinofetasavokale.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/90272148079.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/tikurekugimizegupog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/80195187225.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/exploring_physical_science_1977_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/40011649283.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/87553389812.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_off00005711.bin
c931fe7e5ecd6e16217f92c76343a4eda39f5f3413ec6cdef9b6f9a203298cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5711 5388 bytes
font_01_sfnt_off0000697e.bin
94209748828242e71a907440cbcefca49677c5dcb6606b9d152e868715f4e39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697E 14336 bytes

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