Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7fe335c03b287b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 04:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 287af8cf7559070b2ed507ef5b4e3117 SHA-1: 7a9e436b3941f4b34ca08b5c5b5339ed060b1c1d SHA-256: be7fe335c03b287b1586f31bb1848aa21fb8764e4c422f668e6b4b3890eae3eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/pify?keyword=quantitative+critical+appraisal+pdf'. The document body, though heavily obfuscated, contains text related to 'quantitative critical appraisal pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious links. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the true destination.

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=quantitative+critical+appraisal+pdf
    • http://files.galynjohnsonpc.com/uploads/1/3/0/8/130813614/mawilibu-bobib-miwesumid-suravivikosavo.pdf
    • http://litimopuv.forasplitsecond.com/uploads/1/3/0/8/130814017/3995866.pdf
    • http://files.elevatedarcheryproducts.com/uploads/1/3/1/3/131383981/6ab84.pdf
    • http://temeka.funprintablesforkids.com/uploads/1/3/0/7/130739678/462d347640f4cce.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/tigesejerulipipe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/fireturupuwixamiropa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/ropedemuxiwimekuxivuxo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/disogelabexumuzexo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/buxexugomakodosojorabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/777469144.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/2589667974.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1416/files/skf_taper_roller_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0448/0447/2992/files/laporan_pendahuluan_hematochezia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/87913766977.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d1b.bin
e5493d311379e23cd5d5d48bf0228a3a19d55a8bcadce0f24fed8bf3479a17ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 5268 bytes
font_01_sfnt_off00007f1a.bin
a6ba517cddf2f8c740f0498d476816d6a47d0d92e9c3b9adafaa8ade8f6ec067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 10592 bytes

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