Malicious PDF — malware analysis report

Static analysis result for SHA-256 60646947f7708ae7…

MALICIOUS

PDF

47.0 KB Created: 2020-08-03 23:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24d68d52bbe26d4af14340ba4bcf51c SHA-1: b829fb7992e30905177ed29e6b4ffe1ad47afcb9 SHA-256: 60646947f7708ae707eb014fb8630140ca46b1d853ca1084e1ab1672b3523a8a
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, indicating an attempt to drive traffic to potentially harmful content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to artificially inflate search engine rankings or distribute malicious links under the guise of legitimate documents.

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/pify?keyword=low+cholesterol+diet+nhs+pdf
    • http://files.twinbaysforum.org/uploads/1/3/1/3/131380292/703330.pdf
    • http://files.coachnicknewman.com/uploads/1/3/0/7/130775484/bifitalogep_zejif.pdf
    • http://files.honeybeesweetery.com/uploads/1/3/1/6/131608037/xisuvuluzegomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/4582/6205/files/minecraft_worlds_folder.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/guwako.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/venega.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/kabepaxusudawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/68086652017.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/lewaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/62037595354.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/zupazunulepebap.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1685/files/89840156009.pdf
    • https://cdn.shopify.com/s/files/1/0433/6880/8613/files/41913041899.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/puparakugolukukarifedofox.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_off000074b8.bin
ec2737cd877196a1306da809f2c3c32daccdd90e7f4adeefb6b58df997041570
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 5064 bytes
font_01_sfnt_off00008605.bin
398070f63d0c9983687b371cb37b5f9bb220aeff56ff168b3df2bafd66d02249
pdf-font-stream PDF embedded font (sfnt) at offset 0x8605 13220 bytes