Malicious PDF — malware analysis report

Static analysis result for SHA-256 66efddf4aa186890…

MALICIOUS

PDF

44.8 KB Created: 2020-08-03 04:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8efb0f91b56d61bf13feb0763061d3e9 SHA-1: 8a4288429d323fca1c51978e23c237a6eb2e5bac SHA-256: 66efddf4aa186890c3ccab7a74e7fe78b1521e0bf62c842de7e8b8ff120fc9ae
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 'https://ttraff.ru/pify?keyword=acer+c720+chromebook'. This indicates a likely attempt to direct users to malicious sites, potentially for phishing or malware distribution. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning tactic.

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=acer+c720+chromebook
    • http://files.mackenziebellfineart.com/uploads/1/3/1/4/131406498/dixakod-bikemekozofope-vurudi-lubepuwodawux.pdf
    • http://files.observationsandconclusions.com/uploads/1/3/1/1/131164424/499063.pdf
    • http://files.met-track.com/uploads/1/3/0/7/130739154/venakupovev.pdf
    • http://files.horseandbird.com/uploads/1/3/1/3/131398164/6147944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7614883084.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/16768376551.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/pow_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/63915203003.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/72093494144.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/mojalodenufokatipalorigis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/xusaberaxiwokof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/vk7jg_nphtm_c97jm_9mpgt_3v66t.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/fikokuvug.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/ronobafojekewemaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/for_the_king_cheat_engine.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/topazinamezumole.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_off00007286.bin
812467d756306cf72a50c4f59aef5077e3ac787c0aaa5a39df37adcaae04bc8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7286 5164 bytes
font_01_sfnt_off000083ff.bin
b2769961017d31800536958a9d0305d2ee872d0f1b492dc4509d28add182ef75
pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 10056 bytes