Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a6a42a155efc44…

MALICIOUS

PDF

62.8 KB Created: 2020-11-14 03:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f4f685388518ac79b721455dc8fee86 SHA-1: d366321385798f137bee3cb7f8c44bb3d0a5fc6f SHA-256: 55a6a42a155efc44dadad7bcb3b4b9683428a3eef1418506bbdf5f80b5a5c3c4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are generated and appear to be part of a link farm. One prominent URL, 'https://traffking.ru/strik?utm_term=madea+class+reunion+the+play+123movi', is flagged as suspicious and likely leads to malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/strik?utm_term=madea+class+reunion+the+play+123movi
    • https://ropoxazuwaso.weebly.com/uploads/1/3/4/0/134040565/dulakinemikuw_fatifa_zufupuzis_nudasemudazul.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/kabegeruxopunolen.pdf
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/6386023.pdf
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fae29591151a.pdf
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8e4083119d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mewezekilafef/8927082266.pdf
    • https://uploads.strikinglycdn.com/files/5c547ab5-a2f3-4e73-a2a4-137be157a532/dewalt_dc970_18v_cordless_drill.pdf
    • https://uploads.strikinglycdn.com/files/d9c82ecd-8241-48b4-8321-94357fce1f6a/geduli.pdf
    • https://uploads.strikinglycdn.com/files/9c82f911-16da-4758-9b40-f8517f3de55d/tizewawaxalazare.pdf
    • https://uploads.strikinglycdn.com/files/69444168-a088-4fda-9d53-1d0fc4354838/another_word_for_violence_meaning.pdf
    • https://s3.amazonaws.com/tadovu/sedikulekikazuwopi.pdf
    • https://uploads.strikinglycdn.com/files/cffc1698-7458-4b8d-9000-24882e03a10b/download_google_chrome_os_iso_32_bits.pdf
    • https://uploads.strikinglycdn.com/files/cb02d4f0-a475-4951-8f1e-e98c3c8cb5cf/xadewufirux.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_off0000b360.bin
2379e6db556a3ba56e4ae1fe99588633fac9c0b515a94d98271f78b5d28d7fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 5828 bytes
font_01_sfnt_off0000c72d.bin
59588e668244610bc5a3b1411c31a9318141005f8be0daf8ef1cb96f0ce51fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 11936 bytes