Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91355bebc2e590e…

MALICIOUS

PDF

47.5 KB Created: 2020-07-18 22:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5cb9debdffbf078037b6b381fd93eaf SHA-1: c257f9e0e5d3a7396a2874c24b43debeeeea0291 SHA-256: b91355bebc2e590eb282bc622bfa8da91cb645d530bd4b89730ac94a6d9395a0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=sikkim%20state%20lotteries%2011.55%20am%20pdf'. Additionally, it features a large number of embedded PDF links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. 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/wb?keyword=sikkim%20state%20lotteries%2011.55%20am%20pdf
    • http://files.perryyoungblood.com/uploads/1/3/1/3/131383329/2393668.pdf
    • http://files.easttntours.com/uploads/1/3/1/6/131606035/jujinozed.pdf
    • http://files.zivadancer.com/uploads/1/3/2/6/132696171/8558d5fdcc8f84b.pdf
    • http://files.driftlessareawetlandcentre.com/uploads/1/3/0/9/130969377/691eca19899ef1b.pdf
    • http://files.teamgodent.com/uploads/1/3/0/7/130738562/557acc63d4.pdf
    • https://tesigoxexo.files.wordpress.com/2020/07/zajalofujedo.pdf
    • https://tesukejiget.files.wordpress.com/2020/06/13392159527.pdf
    • https://kudivex.files.wordpress.com/2020/06/sukepoliwugiratasikunila.pdf
    • https://rasozufim.files.wordpress.com/2020/06/definesa.pdf
    • https://nunagevon.files.wordpress.com/2020/07/13758041686.pdf
    • https://suxarazega.files.wordpress.com/2020/07/rowizepitano.pdf
    • https://dulaxagaro.files.wordpress.com/2020/07/xejudogapurozegaf.pdf
    • https://lurevaxi.files.wordpress.com/2020/07/80736132408.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4470/files/zesobexojotidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/pajitokezim.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/tafulirif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/bireritaruverow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/kosub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/nerokezubilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/dafim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.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_off00007c5f.bin
42b0a4e60f12b4c4ef5de559551708174fd6df240ac5f473af0e4649c787109e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5F 5244 bytes
font_01_sfnt_off00008e34.bin
8b5ace2f08c3e4066cc63e207dc82c79a4e9c5f9017e921607823e219a5091b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E34 10028 bytes

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