Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a114c680bfbbeb…

MALICIOUS

PDF

44.1 KB Created: 2020-07-28 22:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43619d88dc99a76e7d2859f8584d5621 SHA-1: acf428a48863d31f1c4106d3937265835a1a2c6e SHA-256: 60a114c680bfbbebeb52aaccbc52cebd4012aedbf308267a87bf16f5030d0436
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, designed to redirect users to external sites. One of these links points to known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier also 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=circle+radius+diameter+circumference+area+worksheet
    • http://files.bfvh.com/uploads/1/3/2/7/132712383/zidepopidotonudibu.pdf
    • http://files.uptildawnpaperworks.com/uploads/1/3/0/9/130969018/patotelinoka.pdf
    • http://files.abbi.ca/uploads/1/3/2/8/132815388/ec4634d5fb6857c.pdf
    • http://files.beachcitywindows.com/uploads/1/3/0/7/130739684/1d88a89ba52d07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/rujonumumatatotoxolube.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/xuxewarivupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5020/4316/files/32597906165.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/novivenowizamogafuvewo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/fajafimujojunowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/7023611569.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/davejolagudup.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/vamexasiwurex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/8551963257.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/99023217549.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/22722639493.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/84516324147.pdf
    • https://cdn.shopify.com/s/files/1/0431/3625/4101/files/lilukidaxemevajakina.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_off000067d6.bin
3182adb206acb7b08c3622969cdaaf7ac93f4ca35271dce29b346c0a5aeadfaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D6 5324 bytes
font_01_sfnt_off000079c6.bin
d3d52e13b86000e495d253fa9ba99ddc6e972ca214ca5725b1bd9d46d96746ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C6 12876 bytes