Malicious PDF — malware analysis report

Static analysis result for SHA-256 63af20a15ab1be00…

MALICIOUS

PDF

49.0 KB Created: 2020-08-22 19:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003cca1e76a004ca26ec469dea0757b8 SHA-1: 90cbdd519d919043fd04dbe7ea7d4454214a6cc1 SHA-256: 63af20a15ab1be002bd22d0ae3b88d72ade0cbaa3bc8b794633cba1e05ef2c49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, forming a link farm, with one link directing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to distribute malware or lead users to phishing 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=angular+custom+form+control+set+value
    • http://files.msoatucla.org/uploads/1/3/1/1/131163740/tiroru-rajujumudejex-mikusobuponateg-movuvidevokan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/ropegobibupatopap.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/vapuvoxogu.pdf
    • https://cdn.shopify.com/s/files/1/0462/3794/1909/files/android_studio_add_kotlin_support_to_project.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/cycloaddition_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3651/files/92468382721.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/how_to_make_a_potion_of_harming.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/32936052851.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/pexabejisogoloro.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/sokusivax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9867/6131/files/gokonukotunopalununerat.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/7960839631.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/urc_8820_cisco_codes.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_off00007ccd.bin
98da4338c4ffba897fa673a990d4d999d4178a41a4a88151cce22fc0ce1994fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCD 5248 bytes
font_01_sfnt_off00008e96.bin
fd26ef0a278c06adb5a85b7c7eda0f70771e67054046628fa8c6077679b04a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E96 12272 bytes