Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c87cf64084abaa…

MALICIOUS

PDF

39.7 KB Created: 2020-07-10 09:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: ed0e22655bdba75d1be528211269037c SHA-1: 67b6801d72230be6b7c4d0306791380bee93f397 SHA-256: e8c87cf64084abaa413fee889b4f7be6a317d6883e41f25df5b54194a3012ebc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The document body text and embedded links suggest a lure related to file conversion, specifically 'convert pdf to jpg online'. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking these links, leading them to potentially malicious 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.cc/wb?keyword=convert%20pdf%20to%20jpg%20online%20150%20kb In PDF document text
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdfIn PDF document text
    • http://files.onefive8.com/uploads/1/3/0/7/130774977/5420233.pdfIn PDF document text
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdfIn PDF document text
    • http://files.pulse-studios.co.uk/uploads/1/3/2/7/132740852/b9a33559cc633b.pdfIn PDF document text
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdfIn PDF document text
    • http://files.mehanphoto.com/uploads/1/3/1/3/131383207/f79cfd0a6.pdfIn PDF document text
    • http://files.ipinternal.com/uploads/1/3/1/4/131437753/pilefege-kafifekunixovod-nixapefaseterof.pdfIn PDF document text
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdfIn PDF document text
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdfIn PDF document text
    • http://files.meliadf.com/uploads/1/3/1/4/131408062/013d96a893128e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://folinezeze.files.wordpress.com/2020/07/24067637250.pdfIn PDF document text
    • https://gebotapigi358268599.files.wordpress.com/2020/06/60822136159.pdfIn PDF document text
    • https://bugigos.files.wordpress.com/2020/06/94126531439.pdfIn PDF document text
    • https://xisipitojeg.files.wordpress.com/2020/06/42878237003.pdfIn PDF document text
    • https://dasawiduved.files.wordpress.com/2020/07/49499058153.pdfIn PDF document text
    • https://bavorekivaso.files.wordpress.com/2020/06/37785680607.pdfIn PDF document text
    • https://jitalexevumo.files.wordpress.com/2020/06/damamokiwekukexesulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43692268827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.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_off00005b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1D 5288 bytes
SHA-256: 105c8ff7f209562d6749ad945dc21007af181176f06a7cb3f47d536c5c842c04
font_01_sfnt_off00006d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 10668 bytes
SHA-256: 33df371e22509d6c751362c297cc134ffd22835c1a6feb56a60f7dbc6fd8a861