Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c797fcb42866f…

MALICIOUS

PDF

44.6 KB Created: 2020-08-09 06:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88e67f83cf7ebae8d84693ccb9dc1924 SHA-1: 73042cd1c30f32838921e7902f44df9a54c15cd4 SHA-256: 028c797fcb42866f769cfc7b0142989479659f3839ea359a472955804089f93d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/pify?keyword=business+email+writing+ebook+filetype+pdf, which likely serves as a gateway to further malicious content or phishing pages.

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/pify?keyword=business+email+writing+ebook+filetype+pdf
    • http://files.dlsu-aki.com/uploads/1/3/1/4/131438460/puzuv-kedabibuf-rasogaratum-xeneju.pdf
    • http://files.fastelectricalrepair.com/uploads/1/3/0/9/130969237/lerivufevize.pdf
    • http://leragidex.sheldonoil.com/uploads/1/3/1/3/131383657/3461612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/380638449.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/xunafonivefajoxixoluk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/janazetapexafopikegobid.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/85981325786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0431/3055/2474/files/blue_prism_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/lalemewawexer.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/5009126448.pdf
    • https://cdn.shopify.com/s/files/1/0430/5397/3657/files/jakikaradizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/71686561284.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/82458941136.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0431/3831/8487/files/ft_gibson_lake_level.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/kowasuvaritosinejonejiza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c8e.bin
786da70a9a887c37d0e5683e2e7151bda4dbbe134a8cc404808687b92747b0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8E 5808 bytes
font_01_sfnt_off00008053.bin
c11a3de8e8368191422e3d0904ecc2805fbf21b41088b78a9c9982eed0176b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8053 10316 bytes

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