Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eee4f9eb8559aa0…

MALICIOUS

PDF

62.5 KB Created: 2020-08-21 11:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0089102ef252acf1f3d3f534fbf547b SHA-1: 42a7f3554d222265bf479547877cc56810b6e1f0 SHA-256: 8eee4f9eb8559aa0944ec582c1254215334959823eca418863e9873823371c35
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to 'Mejores aplicaciones androides' and the authoring application 'wkhtmltopdf', suggesting a lure. The PDF also hosts a large number of external links, many pointing to Shopify domains, likely as part of an SEO link farm to improve the ranking of the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=mejores+aplicaciones+androides
    • http://wazax.dentalinstrumentcenter.com/uploads/1/3/0/7/130776276/fotuzon_zutapomuvexewil_vomoxizotinimo_pomofoxowo.pdf
    • http://files.kmphotographyma.com/uploads/1/3/1/4/131407165/1126974.pdf
    • https://cdn.shopify.com/s/files/1/0463/1199/7605/files/refonitajax.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/pedagogy_of_physical_science_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3791/files/pusujalesuwej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/jerebibup.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/proform_730cs_treadmill.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/lafujamibopusaxupararit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0411/6637/files/sajifadabobunigivu.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_off0000b419.bin
e5641e0cf0220b8fe92a41735ef79429fc4bfa037b2a14dc29db6b8c89f0b58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 5148 bytes
font_01_sfnt_off0000c5b3.bin
a26b0dff043103ad415baf69e56cef54909459a99fba803f99165f8de6a1cc74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 11712 bytes

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