Malicious PDF — malware analysis report

Static analysis result for SHA-256 426340624a0f35b0…

MALICIOUS

PDF

49.4 KB Created: 2020-08-05 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ca8fb643cfcf53c8025763ab884a0a SHA-1: f141bb40ad10b01cc7923e4e48cefae16802c22a SHA-256: 426340624a0f35b051df6843fb2d3b4b039c414c537ce74e551ea473a73f3a52
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of an SEO link farm, with numerous embedded links pointing to external PDF files. The primary malicious URL identified is https://ttraff.com/wb?keyword=geometric%20and%20engineering%20drawing%20pdf, which likely serves as a gateway to further malicious content. No scripts were extracted from this sample.

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=geometric%20and%20engineering%20drawing%20pdf
    • http://files.thekingdomiswithin.com/uploads/1/3/1/3/131378899/bf46c78cdcd91.pdf
    • http://fenome.shinestudiohairsalon.com/uploads/1/3/2/6/132696212/4a8a87336359f.pdf
    • http://files.monsieurwowk.com/uploads/1/3/1/4/131454034/5410760.pdf
    • http://files.floridatennismagazine.com/uploads/1/3/0/8/130874658/dukulugatu-bebam-xuvavojeli.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/xizodaruzol.pdf
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/61391494751.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/razilikojulifizatujuguk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/25432554352.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/14206394844.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2337/files/10194212191.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/41015706837.pdf
    • https://cdn.shopify.com/s/files/1/0448/3996/0737/files/nysc_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/susuzatidisitujujilesuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/jekoxufaxodogidawajavulap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/5069824994.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/zizekutakelob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d1f.bin
aad9687ed73b697919bd9aea0b9540918df08145ae424acbd0405839572bc8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1F 5388 bytes
font_01_sfnt_off00007f72.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F72 2116 bytes
font_02_sfnt_off0000893d.bin
51cf5718505666d4c09d793e3e2dacdb6de9d9ed6ec2daff206ee970e1a56911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893D 15236 bytes

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