Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8bd399d8a6cd19…

MALICIOUS

PDF

46.6 KB Created: 2020-08-31 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34aa654528fb5a650cbe6ea16062b1a5 SHA-1: 9156b062b4fc31b97ece4f28cfb493ffc4024f2e SHA-256: 0d8bd399d8a6cd1930606f940a225eccf95e82bf9e75f53b71ae6a59f57f40b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious link directs users to 'ttraff.com', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'list of plant cell organelles and their functions pdf', suggesting a lure to disguise the malicious intent. The presence of numerous links to external PDFs, even if some are benign, indicates a link farm strategy.

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=list+of+plant+cell+organelles+and+their+functions+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/cassio_wk_500.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/muninumenipaperuloko.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5196/files/signals_and_systems_oppenheim.pdf
    • https://cdn.shopify.com/s/files/1/0440/1076/6486/files/structure_of_fatty_acids.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/kupofedizore.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/zatevi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/67913244220.pdf
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/expanding_brackets_worksheet_corbettmaths.pdf
    • https://static.usrfiles.com/ugd/45fd81_24b03b9491e04946bcba505139e0326a.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://cdn.shopify.com/s/files/1/0438/1900/8160/files/95927829046.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/gesetogimazupefemitif.pdf
    • https://cdn.shopify.com/s/files/1/0440/9645/4808/files/rujumosaxowobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/megaer_bandwidth_limit_exceeded_fix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/84563185930.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_off0000784e.bin
86b1cb1d4088cda991afaf9cd3057d4ecc81f3448633402e3ce6c4dbb7a691b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 5360 bytes
font_01_sfnt_off00008a77.bin
d1c1c3604714067e464f60aa9ce4a74f4ef03ff3ff1009a755e610dc63c9e39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A77 10076 bytes

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