Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d655b3ca806146…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 00:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 649784304effe3409e2230d48e6c0390 SHA-1: 7e47fb3338df3abc54b54ea727b3a1e804fe8566 SHA-256: 69d655b3ca8061467f390a115bf7d2cf78e6c797e133d92f14a6c5d33867ad93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, masquerading as a "characteristics of c language pdf" resource. The primary link, https://ttraff.ru/pify?keyword=characteristics+of+c+language+pdf, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=characteristics+of+c+language+pdf
    • http://files.alatebloomer.net/uploads/1/3/0/7/130775640/bapivel_tepadodawapa_rixuzisimuref.pdf
    • http://files.parkerpaigeevents.com/uploads/1/3/1/3/131383386/xugofelotuwumilajes.pdf
    • http://napuket.berwickcostumehire.com/uploads/1/3/1/4/131437886/nabifolu.pdf
    • http://files.waltpadgett.com/uploads/1/3/0/7/130739601/5d0e4d19e9d.pdf
    • http://lepib.pastorguy.org/uploads/1/3/0/9/130969723/4f1bced57573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0449/4472/0040/files/biblia_de_estudio_reina_valera_1960_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/27920414185.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/dibexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/99198995010.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/d_d_3._5_blank_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7974/files/89006505315.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/70958141857.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/354_amendment.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/african_liberation_theology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006765.bin
6c7a7336ac108047c81dd31432832c55804f8b158f937c0d993eae7397f0593f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 5320 bytes
font_01_sfnt_off00007976.bin
d3eeb3957751a54b618cfc84c8c9313e0ac1cece697c566b9a249e4823378bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 10208 bytes
font_02_sfnt_off00009c51.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C51 4324 bytes

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