Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b021acdd8adfe4f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-02 21:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd936eae5a3c5f5f7df1dea09b3928f SHA-1: 79400d9dc7ed8d35b01c9ff3adebd32cae25dcbc SHA-256: 0b021acdd8adfe4f2b830db579c0037d11d993e5a1770085bda331a64c5c159e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=vtr+262+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity appears to be the redirection to external sites.

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=vtr+262+pdf
    • http://files.northshorebostonrealtor.com/uploads/1/3/0/9/130969673/jabufakenafat.pdf
    • http://files.hopespayneuter.org/uploads/1/3/1/1/131164440/luzoxexafase-pigukewuxe.pdf
    • http://files.gwenjacksonstories.com/uploads/1/3/1/3/131381675/3939388.pdf
    • http://files.alashmb.org/uploads/1/3/1/6/131637477/virokizagilute.pdf
    • http://files.koshercorner.org/uploads/1/3/1/3/131383848/f733f0adc4c7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/sewowodivifipek.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/levebekulanorizomugaru.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/9784994277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gozoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/3d_world_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/23435589535.pdf
    • https://cdn.shopify.com/s/files/1/0440/5500/3286/files/lifum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/tarip.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/mazozurolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/68853104981.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/80790929271.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3569/files/60396584893.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/48213344308.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/vikonon.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_off00005c49.bin
55754a8af7ca298e6575df54fa29eba9305e4bac400abbdaab50390a177721a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 4868 bytes
font_01_sfnt_off00006cf8.bin
b997cdf6d88695fb97bb124b729e64c1a6659f231d6b78ea16d3bd38c436d8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF8 14148 bytes

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