Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e47816014b2b41…

MALICIOUS

PDF

43.0 KB Created: 2020-08-13 22:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5383bc57d1d3f6ba083c3157439084e7 SHA-1: 1ccfe53fefd1777cafef02600af495e68a692ec9 SHA-256: 61e47816014b2b4152945eb76a356ade693cf71ec67e588e3de38048cb1a32f5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known to host malicious content. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the suspicious URL, suggesting an attempt to lure users 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.ru/pify?keyword=android+dialog+positive+button+color
    • http://dabusu.conservatoryathome.com/uploads/1/3/2/8/132814989/1285634.pdf
    • http://files.darbsterdog.com/uploads/1/3/0/7/130739533/dixok.pdf
    • http://boxigobok.enjoyourlife.net/uploads/1/3/0/7/130739678/nosopiserojegisixi.pdf
    • http://files.100womenchicago.com/uploads/1/3/0/9/130970009/6d8089b.pdf
    • http://juwevebek.danadanleyphotography.com/uploads/1/3/1/3/131380845/3102272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevadijuxirefasu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/jozidunajeredo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/9381420368.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/96948748228.pdf
    • https://cdn.shopify.com/s/files/1/0437/6238/5045/files/kivokubivetik.pdf
    • https://cdn.shopify.com/s/files/1/0447/9755/8941/files/accuracy_and_precision_physics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/zefizazutisuruxobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5294/0968/files/dilavinovanigabopat.pdf
    • https://cdn.shopify.com/s/files/1/0428/7456/8860/files/bibliotecas_escolares_cra.pdf
    • https://cdn.shopify.com/s/files/1/0448/3029/4177/files/blood_pressure_definition.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_off000068dd.bin
bf776e7ae5aa21c8806fc48b181d41f6c0125c30c7e37da32d0ee750120c8195
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 5432 bytes
font_01_sfnt_off00007b62.bin
16abe15bb286c8c1942970ac70d8196da8e47155c530451f5d67134f824e545b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B62 10300 bytes