Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6f7e4af8d6d609…

MALICIOUS

PDF

55.9 KB Created: 2020-08-01 17:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe1dbae402e67588aeb5c0bee563ff6 SHA-1: ec9a4d93db9ab1e537ee5d3d76de65f6827f5a20 SHA-256: fa6f7e4af8d6d609bd7fe3abb69b49eddc6aa28825d8c31de6bce486c8b25b42
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link to `https://ttraff.ru/pify?keyword=minecraft+diamond+helmet`, identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and a Minecraft-themed title, suggesting a lure. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO-based link farms used to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=minecraft+diamond+helmet
    • http://files.nolimitcombatives.com/uploads/1/3/1/0/131071063/3743059.pdf
    • http://files.lovinlifedeepcreek.com/uploads/1/3/1/8/131871642/5121329be1a.pdf
    • http://files.benefitsselection.com/uploads/1/3/1/8/131871488/vupedep.pdf
    • http://files.hollywooddecorstores.com/uploads/1/3/1/0/131070674/0a44c5e9b04.pdf
    • http://files.nolimitcombatives.com/uploads/1/3/1/0/131071063/3743059.pd
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/83175159921.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/fepojepajesotil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/1455434085.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/kokikaxabagenotagow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/vatiwazegutizapop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/fonupakepokezopufebumiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/3220483039.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/16575573111.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/26322364463.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/sewupuravoded.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/94687271750.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/46427435322.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_off00009d21.bin
c042d3f731123e8102faa839ebf2906082fcae215a607344b54c4e8810607505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D21 5088 bytes
font_01_sfnt_off0000ae52.bin
85f12d92ef21e8e1d809927a94d1d6dc43bd050a6878b0e7c04d5742334d8df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE52 10632 bytes

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