Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638ef60c4cbf543…

MALICIOUS

PDF

36.7 KB Created: 2020-08-22 04:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9865d744490b7b61a8b70c533b0ba380 SHA-1: 51467f09ffd3d5c7ea55b85e318a901225257bdb SHA-256: 2638ef60c4cbf543918a3349f0b8ed7d95fa8d1cd39d6e2c06b88c2b9d0ff72a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and at least one critical link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to direct users to malicious infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=arris+surfboard+manager
    • http://files.newyorkstategrandcouncil.com/uploads/1/3/1/4/131437538/bapemo.pdf
    • http://files.forcesix.com/uploads/1/3/1/3/131379815/sosalifokaxaxobuw.pdf
    • http://files.stpaulspreschool.net/uploads/1/3/0/8/130874524/717660.pdf
    • http://tizilozes.stincrowvoden.com/uploads/1/3/0/9/130969280/zagirajukas.pdf
    • http://vaget.vallenduuk.pl/uploads/1/3/0/8/130814873/77fe67.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/45791693566.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/lifobifibigotimab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/84502808761.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/gosidufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/bomepepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/sobeboneje.pdf
    • https://cdn.shopify.com/s/files/1/0436/3934/1216/files/finding_gcf_and_lcm_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/5121052209.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/gabubudetadoviti.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/dajabomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/95275302993.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/91993179036.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_off00004dcf.bin
0d6b5abe3b34058435ca5b9a6afa5d3098134b7906cd08bebea004c8995de0ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCF 5324 bytes
font_01_sfnt_off00005fcc.bin
6ab0ca606add21ca501da43d4a5883b6f618bd15cdbf1210cebb03b1e581b687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 10808 bytes

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