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)
MD5: ed0e22655bdba75d1be528211269037c SHA-1: 67b6801d72230be6b7c4d0306791380bee93f397 SHA-256: e8c87cf64084abaa413fee889b4f7be6a317d6883e41f25df5b54194a3012ebc
154 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 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.cc/wb?keyword=convert%20pdf%20to%20jpg%20online%20150%20kb
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.onefive8.com/uploads/1/3/0/7/130774977/5420233.pdf
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdf
    • http://files.pulse-studios.co.uk/uploads/1/3/2/7/132740852/b9a33559cc633b.pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.mehanphoto.com/uploads/1/3/1/3/131383207/f79cfd0a6.pdf
    • http://files.ipinternal.com/uploads/1/3/1/4/131437753/pilefege-kafifekunixovod-nixapefaseterof.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdf
    • http://files.meliadf.com/uploads/1/3/1/4/131408062/013d96a893128e.pdf
    • https://folinezeze.files.wordpress.com/2020/07/24067637250.pdf
    • https://gebotapigi358268599.files.wordpress.com/2020/06/60822136159.pdf
    • https://bugigos.files.wordpress.com/2020/06/94126531439.pdf
    • https://xisipitojeg.files.wordpress.com/2020/06/42878237003.pdf
    • https://dasawiduved.files.wordpress.com/2020/07/49499058153.pdf
    • https://bavorekivaso.files.wordpress.com/2020/06/37785680607.pdf
    • https://jitalexevumo.files.wordpress.com/2020/06/damamokiwekukexesulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43692268827.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b1d.bin
105c8ff7f209562d6749ad945dc21007af181176f06a7cb3f47d536c5c842c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1D 5288 bytes
font_01_sfnt_off00006d45.bin
33df371e22509d6c751362c297cc134ffd22835c1a6feb56a60f7dbc6fd8a861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 10668 bytes

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