Malicious PDF — malware analysis report

Static analysis result for SHA-256 c911bf163ee69c08…

MALICIOUS

PDF

89.8 KB Created: 2020-10-08 19:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb5dfc2c6b0d8371e4d9b2a36d357242 SHA-1: d8ca5f805384812ad239545dd07ae284a807b319 SHA-256: c911bf163ee69c082ec35b7fb66a211401c5a39c1846f3509231805d6312046f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which appear to be disposable. The primary lure is a BMW 850csi for sale, which redirects through a malicious redirector to a link farm. This suggests a phishing or scam attempt designed to drive traffic to potentially malicious or ad-filled sites.

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://ttraff.link/pify?keyword=bmw+850csi+for+sale In PDF document text
    • http://files.theoldcabinco.com/uploads/1/3/2/6/132681144/6250967.pdfIn PDF document text
    • http://gadizu.andrezsemini.com/uploads/1/3/0/8/130814010/3b9ec9f.pdfIn PDF document text
    • http://juwazap.susannebrandstaetter.com/uploads/1/3/0/7/130775853/mapijogetupuzes_zusodugavuwod_lasodigo_vexuxewiwejukow.pdfIn PDF document text
    • http://files.infinityhealingcenter.com/uploads/1/3/2/8/132814476/255d037d71.pdfIn PDF document text
    • http://files.artworkcroasdaile.com/uploads/1/3/1/3/131398113/4576092.pdfIn PDF document text
    • http://livogi.tchristal.com/uploads/1/3/1/3/131381761/7682287.pdfIn PDF document text
    • http://files.bsmithcreditservices.org/uploads/1/3/1/6/131636766/bebejewidiwipux.pdfIn PDF document text
    • http://kemifas.judyadhdcoaching.com/uploads/1/3/1/4/131409090/1419329.pdfIn PDF document text
    • http://files.doorway.org/uploads/1/3/0/7/130775286/xejabimosapakotipaka.pdfIn PDF document text
    • http://lavizadab.shavanocreek.com/uploads/1/3/2/3/132303238/vodefelutozifafu.pdfIn PDF document text
    • http://keburag.kalicoaching.org/uploads/1/3/1/3/131383042/zulotor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/51353e32-5da5-4ebf-a953-01dc975e3db4/82603074840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefddb26-63c6-4d89-a506-55a7c971db3d/77910078081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7195641d-dd50-4a88-9f38-249b007f8e4e/59847507663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5624c5-892a-4d80-a522-8cdf876c5d09/29059832283.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 5228 bytes
SHA-256: 2836d485ec727aa3ca063cca8781d53cde4297ce1d0359dc90c5f5bdb8b66bf9
font_01_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 11044 bytes
SHA-256: 2daca8cd50f7b218850f970f4d50d4aa4bf8058fe67d57db05b1d6a758a6d999
font_02_sfnt_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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