Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f5df470d325905…

MALICIOUS

PDF

46.1 KB Created: 2020-07-21 06:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccc16b381570377abf3383981b0126b SHA-1: bedfb84bfbea184750b6ae6b483a21a9aaccd17e SHA-256: 86f5df470d325905e0e90d3cf6864e89e4dc8ffc66bc2e9ac05c795d9a0d36af
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware delivery site.

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=les%20fosses%20nasales%20anatomie%20pdf
    • http://files.researchjunction.net/uploads/1/3/1/6/131607331/df1b47d.pdf
    • http://files.summerlandchurchoflight.org/uploads/1/3/1/3/131383842/166ba4bf.pdf
    • http://files.sophiascheffel.com/uploads/1/3/1/3/131380511/5889599.pdf
    • http://files.canonbievintageclub.com/uploads/1/3/1/4/131482975/siguz.pdf
    • http://files.florenceroadmarket.com/uploads/1/3/0/7/130738943/a63a587e6d8f9.pdf
    • http://files.canonbievintageclub.com/uploads/1/3/1/4/131482975/sigu
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/dasifebekadesumemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/97762357389.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/18937741556.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/dasapivorodunaxij.pdf
    • https://wijijew.files.wordpress.com/2020/07/35008395930.pdf
    • https://jatipeku.files.wordpress.com/2020/07/ralosowimunedeganaj.pdf
    • https://fuzevibob.files.wordpress.com/2020/07/5427786763.pdf
    • https://mitalaj.files.wordpress.com/2020/07/71030843872.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/2367316802.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/wogokirezup.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/18041736404.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/tojoxukudule.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/22634012062.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/23650012808.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_off000077a7.bin
a8044af1c2ff2e399b415daa1308644f67ece854d76e49625cc8d08b8da24d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A7 4820 bytes
font_01_sfnt_off000087f7.bin
0ca4d3f4ee9d5cb68fe07a057331fc5fd3c784db770527a5f677c6490d08c722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F7 10652 bytes

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