Malicious PDF — malware analysis report

Static analysis result for SHA-256 843870056a7eb685…

MALICIOUS

PDF

45.1 KB Created: 2020-09-11 22:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ebe07b7657e059887859059ff0ccb8 SHA-1: 1067eeea0a2828644926d6bf642bf6b6c080dbc2 SHA-256: 843870056a7eb685e7d6a8325208b4e48c072e42f0b45c660c73328739cccf48
154 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, a technique often used for SEO manipulation or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text but includes a URL that matches one of the identified heuristics. No scripts were extracted from this sample.

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.link/wix?keyword=android+bitmap+image+size+in+xml
    • http://mamij.forestcobbler.co.uk/uploads/1/3/0/7/130738950/taxun.pdf
    • http://files.magn8ventures.com/uploads/1/3/0/7/130775245/dozirodonid.pdf
    • http://files.houstonmiddlebands.com/uploads/1/3/1/4/131453132/jijesinizudetope.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/jumosukot.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/bootstrap_template_for_tutorial_website.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/rosojokeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/anexar_a_word.pdf
    • https://cdn.shopify.com/s/files/1/0463/7130/7681/files/13264268852.pdf
    • https://cdn.shopify.com/s/files/1/0456/4801/9623/files/73705390314.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3975/files/depudip.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/87662173030.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7414/files/fozuxipafod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/merriam_webster_dictionary.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_off000065ff.bin
81d8548aa30dc77adcbab443db8867a8072b4c5bee3411f776ebed199ad55ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x65FF 5524 bytes
font_01_sfnt_off000078b7.bin
83d52bb85c574d7adb9f49293a7bdea88c2836d3f25489a5db67623ee2bbc08c
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B7 14896 bytes