Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7861a81746ef53…

MALICIOUS

PDF

40.4 KB Created: 2020-10-09 01:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26405d015c982e0b3389aa8efa313277 SHA-1: edc4cd843f4fd2b95d519772e1869995868cf317 SHA-256: ef7861a81746ef532ac97662860bbd6940a6a8736e852500a6a5ed39577908b6
184 Risk Score

Malware Insights

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

The PDF contains a lure promising free accounts and passwords, directing users to a URL that is part of a link farm. This link farm consists of numerous PDFs hosted on disposable domains, likely intended to generate traffic or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the heuristics confirm the document's nature as a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/pify?keyword=animal+jam+free+member+accounts+and+passwords In PDF document text
    • http://files.eglobalpro.net/uploads/1/3/0/9/130969663/968650.pdfIn PDF document text
    • http://files.communityartistsgallery.org/uploads/1/3/0/7/130776446/456645.pdfIn PDF document text
    • http://files.oakway.org/uploads/1/3/1/4/131438501/vopivubuzalige_kuwekami.pdfIn PDF document text
    • http://mujijovi.masakanekodesign.com/uploads/1/3/0/8/130813632/bba542981610496.pdfIn PDF document text
    • http://rakogido.stellabread.com/uploads/1/3/1/3/131398285/b17eb0130db9b.pdfIn PDF document text
    • https://site-1040442.mozfiles.com/files/1040442/kidevaw.pdfIn PDF document text
    • https://site-1038840.mozfiles.com/files/1038840/towode.pdfIn PDF document text
    • http://moxadupan.menchavez.com/uploads/1/3/1/8/131871781/jakupir_pidutipona_robedujav.pdfIn PDF document text
    • http://files.coloradostateprssa.com/uploads/1/3/0/7/130739624/winulomitokugi.pdfIn PDF document text
    • http://files.lancasterpressurewashing.com/uploads/1/3/0/9/130969160/7316906.pdfIn PDF document text
    • http://dalok.nqta.org/uploads/1/3/0/7/130775889/lewedujakule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1271/8233/files/diabolik_lovers_episode_12_english_dub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3277/2757/files/89042808555.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5917 5600 bytes
SHA-256: fd872c498abfd261c35a3ed304d4bbe2798c2cd02b3946fe512d3df0cca4769e
font_01_sfnt_off00006c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1B 12852 bytes
SHA-256: 61f2ac8854c289903b24961cd9f842c4cd2d950b5f8410eb09035585fb4ceaf2

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