Malicious PDF — malware analysis report

Static analysis result for SHA-256 084625c3b3ad4be1…

MALICIOUS

PDF

51.5 KB Created: 2020-07-29 20:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ab5fa8446ea7c7f85e30aa1c34f967 SHA-1: 83128c37ba4900058e28e0befaeefe2abd21f219 SHA-256: 084625c3b3ad4be1ed904aa8ced28f836eeb1476a70c3c5110e07b537d1cbbda
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content across multiple sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

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=bipap+a40+brochure+pdf
    • http://files.cuisinierssansfrontieres.org/uploads/1/3/2/7/132712209/timivubojalarob-xonorofipes.pdf
    • http://files.yvccolumbia.org/uploads/1/3/0/8/130813979/sepigukidip_degiretere.pdf
    • http://files.peeblesfootball.com/uploads/1/3/1/4/131453354/23217837e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/muluzor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2823/4908/files/rusoparusukotile.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/jilelakevaxasezarenutiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/18869602451.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/kukemirugojuvubes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/38834392419.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3475/files/21632270328.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/82658117936.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/7176320818.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/donesotapawetejifiz.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_off00007a94.bin
047d4630cda0191940cb4057abc2db973e0d3e97dc63522b16969cef4d301c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A94 5148 bytes
font_01_sfnt_off00008c18.bin
4d57fc0a5e77fee8edd251adae9d6dc4bf60e8d9cfffcee552f373bb1f471146
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 17244 bytes