Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c0ddda17a0bfc…

MALICIOUS

PDF

47.5 KB Created: 2020-07-30 17:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed8598a6d82ff1a90b58fb75f603a373 SHA-1: 4417d8d498485dcd9b5c805c0accbf894355b901 SHA-256: c83c0ddda17a0bfc57afa3c533a151b9852ce06b7765e09a630d9f38730eee51
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

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=alcoholismo+tratamiento+psicologico+pdf
    • http://files.jessicacomeaudulcimer.com/uploads/1/3/1/1/131163658/tumixexu.pdf
    • http://files.pdbravard.com/uploads/1/3/2/3/132302871/f96e0644.pdf
    • http://files.fatherheartcanada.com/uploads/1/3/1/3/131384301/kibudajevapaxe.pdf
    • http://files.farmflightaz.com/uploads/1/3/2/3/132303175/6978210.pdf
    • http://files.the-culper-ring.com/uploads/1/3/2/7/132740586/a923a8d3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/vunepolunolug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/91815732938.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/felifabop.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/nesasalewulajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/28588809931.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/femusedawanoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/67955895002.pdf
    • https://cdn.shopify.com/s/files/1/0439/4024/9755/files/rupisitodipoleveju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/damopujosedinabum.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/dodolorut.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/63007037433.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/6966917911.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_off000079d8.bin
e1c54aa899ecac23057f2b347cc00b948243a4eb3e3a78a6cebf762ae3be7dff
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D8 5344 bytes
font_01_sfnt_off00008bc8.bin
c0b1449befa61c3969b2963742014d04044bd91efa6ec82ac44b28ab0f9da75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC8 10828 bytes