Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ffc31d7c0e2400…

MALICIOUS

PDF

63.9 KB Created: 2020-08-07 03:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f043aa7fe0dffb53bd712f035652d74b SHA-1: a3e32432ba631e0361c723e456dcea6e5b90ce08 SHA-256: c4ffc31d7c0e24005c9eb37a0ec8fc8f9adbb8075788e00a9ab58f7b1cc25d1f
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.cc, indicating a redirection to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic further supports this by identifying a mass external PDF link farm. No scripts were extracted, but the sheer volume of links suggests a social engineering attempt to drive traffic to malicious sites.

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=pangyo+techno+valley+pdf
    • http://pofefu.courtingkenya.com/uploads/1/3/1/3/131381464/e8d1c.pdf
    • http://files.masteractorsbayarea.com/uploads/1/3/0/7/130776575/1930798.pdf
    • http://files.professionalservicescouncilfoundation.org/uploads/1/3/0/7/130775228/ad816d7982.pdf
    • http://files.iowaahperd.org/uploads/1/3/1/3/131398308/5cf4ca3.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/sixobifawemufekorulilosuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/losesevev.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/8153574240.pdf
    • https://cdn.shopify.com/s/files/1/0434/3395/1399/files/minecraft_seed_map_generator.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/gutogexoribajewi.pdf
    • https://cdn.shopify.com/s/files/1/0440/9724/1240/files/sabuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/67528089470.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/58942138051.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/58239307904.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/56192133195.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007695.bin
58fb2a84d809d7ad713c6bf92ca1a3f949f19f0a68113a91660b4cf7b5066b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 14740 bytes
font_01_sfnt_off0000a319.bin
69d04bb4a9de835ba892293aea8a018b245fd1ae8ccf8aa417483568054753fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA319 5308 bytes
font_02_sfnt_off0000b53e.bin
c7e825b475fe44024327dc8ee5b466d9accf51ce4ee76715ef1dc3cf81965f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB53E 11236 bytes
font_03_sfnt_off0000dc0e.bin
a076e9cd2b92a984f4c9fb97006aa241b4a53f0d0f3b45a8da0b151c56bda7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 16060 bytes

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