Malicious PDF — malware analysis report

Static analysis result for SHA-256 e125603f680e6a20…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 09:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe31a2ff5affa5e4ad13004214c64e4 SHA-1: 380bb005b52583d946c13251d89c577cc64fde72 SHA-256: e125603f680e6a2031780d87aa80df6fcd34204c556a4edde6b595dc05dc4ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a free PDF to Word converter. The ML classifier strongly indicated maliciousness, and the PDF was found to contain a large number of external links, many pointing to Shopify domains, likely for SEO manipulation to increase visibility of the malicious redirector. The primary malicious IOC is the ttraff.cc redirector URL.

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=convert+pdf+to+word+online+for+free+without+email
    • http://files.zazaboocosmetics.com/uploads/1/3/1/3/131379246/movopu_dawururekaweve_zotosule_tokeruvo.pdf
    • http://files.reno1432.com/uploads/1/3/0/8/130814232/kufumelinupuvanarito.pdf
    • http://files.smalltalk-maadi.com/uploads/1/3/1/6/131606046/mafavafeze-bowepat.pdf
    • http://files.bullitteastarchery.com/uploads/1/3/2/6/132681384/1214900.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/93602740249.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/jspdf_autotable_header_and_footer_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/gifimokax.pdf
    • https://cdn.shopify.com/s/files/1/0438/1140/5986/files/31994381647.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/amplitude_shift_keying_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/punititom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5926/5188/files/34313393284.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/73541759803.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/86585147887.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/kazapunawitezezatesinusud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/99329881202.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ce.bin
1985fd4280f0f259147df241f03e8e5c45dcee63e87bf91388ed2509a98380a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 5160 bytes
font_01_sfnt_off00007341.bin
169076350ef6a1a8c354963d9c646213d5d1b7fb2f4cb971ff8b903dadb5ba10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 10584 bytes
font_02_sfnt_off00009607.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9607 4324 bytes

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