Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb9f873ed0e871b…

MALICIOUS

PDF

47.5 KB Created: 2020-08-10 15:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1846dfef47fca11ba49919fd1dd075 SHA-1: a1e33a42e68223a7517e3a23ac4eb3a241c80223 SHA-256: afb9f873ed0e871b221ec2fc28bcc7d75482fb83871375fd5bb8fd6ec755d243
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=advertisement+effectiveness+pdf'. This suggests the document is designed to redirect users to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same URL and references to advertisement effectiveness, reinforcing the lure.

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=advertisement+effectiveness+pdf
    • http://files.goringgapinbloom.org.uk/uploads/1/3/2/6/132683292/dipizefe.pdf
    • http://files.invictainstitute.com/uploads/1/3/1/8/131857476/5614041.pdf
    • http://files.megs-eggs.com/uploads/1/3/1/4/131406507/6ab1e37ea5.pdf
    • http://files.foolsandhorses.ca/uploads/1/3/0/7/130739330/9290533.pdf
    • http://files.outhereadventure.com/uploads/1/3/1/1/131164546/teziwuvuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/48004650759.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/kevekujexapefufup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/logadunon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/luxefaze.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/73333113393.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/fifowepaburuwevatineke.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/zupujala.pdf
    • https://cdn.shopify.com/s/files/1/0448/2190/5570/files/xoged.pdf
    • https://cdn.shopify.com/s/files/1/0433/6612/1623/files/jolly_phonics_word_bank.pdf
    • https://cdn.shopify.com/s/files/1/0436/3350/8512/files/91352127202.pdf
    • https://cdn.shopify.com/s/files/1/0438/5469/2512/files/19349646413.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_off00006d12.bin
7e7895eb8871f49089a37d8af965318cb80e0500e52b3e2e37cab2ea7afe6e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D12 4784 bytes
font_01_sfnt_off00007d3c.bin
249e4ee52adda9f2ebef03c8ab1054092771a90aba63dbeb52bb48571a2d520e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 10980 bytes
font_02_sfnt_off0000a2c1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C1 4324 bytes

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