Malicious PDF — malware analysis report

Static analysis result for SHA-256 054e21a59cdbeb7d…

MALICIOUS

PDF

39.2 KB Created: 2020-08-01 16:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41ca6d47ec6fa9caa0597a11b42bf1ba SHA-1: 7cfa0cae2a7e620430d577d58ce1eb31c4015869 SHA-256: 054e21a59cdbeb7df9dfbf23ad8736973f931a265824d88ef80efcf6d25b8e36
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One of the primary links directs to a malicious redirector at `https://ttraff.ru/pify?keyword=apc+xs+1300+manual`, which is likely intended to lead the user to further malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the link farm and redirector findings.

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=apc+xs+1300+manual
    • http://files.evolutionbjjpetawawa.com/uploads/1/3/0/8/130813859/batanujos_vumijoguda_madunulurazi.pdf
    • http://files.hotelsomando.com/uploads/1/3/0/7/130739772/2104154.pdf
    • http://files.weedspoon.com/uploads/1/3/2/6/132681213/talam_tojuna_jamawadugoxim_periruwumasun.pdf
    • http://files.ivnonline.info/uploads/1/3/0/7/130775403/lejob.pdf
    • http://files.hardwickwinery.com/uploads/1/3/0/8/130813667/9232181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/rafutafosapuwubiri.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/81477205239.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/xudazojiruwotete.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/nujixigobikal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/paladin_oath_of_the_crown.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/nexoxufaref.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/60432524625.pdf
    • https://cdn.shopify.com/s/files/1/0437/6887/3112/files/96909835247.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/wujijurel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/givuxagi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/gibibagumer.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_off00004e80.bin
5c7a2b0595f202e22fc131ec7ab6e52d0840e3b44978f89ba2616373b2e2860d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E80 5400 bytes
font_01_sfnt_off000060d7.bin
4835fc1778d6eb57690b9a2348c3ad508a6557d41600d8b9a5339998ac54ddc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 14868 bytes

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