Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a287a4ec416c8ae…

MALICIOUS

PDF

49.5 KB Created: 2020-08-06 06:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5646d5710d58f359399cb6077e71da SHA-1: e38154e8eee7fed85021c5cfdab6089afa918f53 SHA-256: 0a287a4ec416c8aed391c53337378ea09b18529d39f6eb6149e9094861d752f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam campaign designed to drive traffic to malicious sites, potentially 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.cc/pify?keyword=bishnu+prasad+rabha+pdf
    • http://files.sistersofhope.us/uploads/1/3/1/4/131406558/vafogigibover.pdf
    • http://files.karolinabohn.com/uploads/1/3/2/7/132712000/lixovuxakof.pdf
    • http://biluw.diamonddashmealprep.com/uploads/1/3/1/3/131398091/d1b30a38cf01610.pdf
    • http://files.activefittraining.com/uploads/1/3/0/8/130814216/fe75e5f5a.pdf
    • http://files.balletvermont.org/uploads/1/3/1/6/131606367/4143c06ce88bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9664/4511/files/43134112338.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/megirogifopav.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/solving_linear_equations_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/78954893145.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/dolumavafezox.pdf
    • https://cdn.shopify.com/s/files/1/0438/0763/7661/files/how_to_mine_cobalt_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/21906542152.pdf
    • https://cdn.shopify.com/s/files/1/0436/9547/2794/files/anthem_ayn_rand_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/rigiwutatafezetopaxajuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/investment_valuation.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0486/files/93610952657.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/wowavadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/4864213437.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_off0000854c.bin
a3e60a5f4a84b0ec4672415d55502d8f40c50eb3d29732ce6adae1bfe5a4b4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 5288 bytes
font_01_sfnt_off00009736.bin
ba89daa40f15e02f9c8c25e382cb053ec1ac7b8f3be6620db39e59bca1b29f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9736 9968 bytes

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