Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4c1de612a30f99…

MALICIOUS

PDF

36.1 KB Created: 2020-08-01 21:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311f8e4f3c57a650887d389dcdfa9ff8 SHA-1: 7a8665d823ba29cd89b04528583f8e526a8eafa4 SHA-256: 7f4c1de612a30f9948ff31e12b18bf2ca3162bcd23e5bb8afd588fde69488a84
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to deliver a secondary payload. The document body and embedded links suggest a social engineering attempt to trick users into clicking the link by posing as a Solidworks tutorial. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=solidworks+electrical+routing+tutorial+pdf
    • http://files.triplea-solutions.com/uploads/1/3/2/6/132681392/dibowakesuvatimo.pdf
    • http://files.nbestimating.com/uploads/1/3/0/9/130969889/b8f35fb0f.pdf
    • http://files.mkclardy.com/uploads/1/3/1/4/131452842/pemimolerese_nasonugifuforo_xadolapimoloko.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/26159724976.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/tanopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/wibaloga.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8526/files/wevejomo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/59194331608.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/kimijatalazutekavarovilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/jadefaler.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/luduvifujiliwew.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/98453638153.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/98264158999.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/vavagimokiromasusimozabag.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_off00004d6f.bin
b0295118975870d0e0615e34aa635ffaf9414c05665f5545b7909e53b41dbbda
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6F 5580 bytes
font_01_sfnt_off00006092.bin
5fd031a6639c13a6865519a6369e72e637de1fb50ec38bb4c9fd60842477417f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6092 10168 bytes