Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfa8c21415c81cf…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 04:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a2253f1092031d7af8d7bc31b30fcc SHA-1: ac1f63a22184f640add100a7c15e54d259ee26ac SHA-256: 0dfa8c21415c81cf97acc5d0f63937c950022ca909da3a77b517a37349330a63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=k%25C3%25B6pekler+i%25C3%25A7in+bira+mayas%25C4%25B1+ve+sar%25C4%25B1msa'. 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.com/wix?keyword=k%25C3%25B6pekler+i%25C3%25A7in+bira+mayas%25C4%25B1+ve+sar%25C4%25B1msa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_fdc282079e82424ca25f13a1dc5378d9.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_7bb89028f1994b65b329b37b099c4dc9.pdf
    • https://static.usrfiles.com/ugd/cafc24_627115c515434c9b834e349d88b94cdc.pdf
    • https://static.usrfiles.com/ugd/91e123_dbb8bd6b7bb64e1d8b60740c21af3c8e.pdf
    • https://static.usrfiles.com/ugd/c068f8_6a7400a06c7c42e987f71a6d1b409fc8.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/the_power_of_forgetting_mike_byster.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/lozuzarisatowirukafipevek.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/annapolis_mall_directory.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/sotovimegunusopusanep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/setisidigonoxotukovituna.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/synonym_for_wants.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/76323890808.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616c.bin
f52f3dfd1f1a6c912f372dc3140b317c0ef10f203f2a51fe7b476176ceb34a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5248 bytes
font_01_sfnt_off00007327.bin
6691db4eb344420609d49c03b36fae0bea162c7057805b575e3fb5b433b89679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 13064 bytes
font_02_sfnt_off00009af0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF0 4324 bytes

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