Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef5655260180c55…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 07:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e967e08dbd932f5a2c375a4d765eb0c4 SHA-1: dd42e964c5e32b2dfa8b7d2c17bdaa95c0d54254 SHA-256: 7ef5655260180c556e16914cfe89176e07b74b31e52cc39618b530368064a8fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to a link farm designed to host other PDFs. One of the primary links, 'https://ttraff.cc/pify?keyword=groups+of+food+worksheets', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing 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/pify?keyword=groups+of+food+worksheets
    • http://files.fwrna.org/uploads/1/3/1/0/131070202/tudojujov.pdf
    • http://bigito.boostfitness.co.uk/uploads/1/3/1/8/131856408/fapefemilepepo.pdf
    • http://files.lorimuldoon.com/uploads/1/3/1/4/131409574/kefutona.pdf
    • http://pedomefi.redlineinstallers.com/uploads/1/3/2/6/132680981/jojufunijovowewobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/27001855104.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/animal_farm_enotes_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/52913590095.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/ceh_official_certified_ethical_hacker.pdf
    • https://cdn.shopify.com/s/files/1/0430/3604/9571/files/nebolomudit.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/bulemabifobovilizoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/zajojeforevepoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34292265756.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/44554247476.pdf
    • https://cdn.shopify.com/s/files/1/0443/1472/2460/files/lean_six_sigma_black_belt_certification.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/36026499046.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/rixopaba.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4105/files/altium_designer_tutorial_espaol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin
3de7a4e2ecf23803424b8c9dc2c67998d9d8beced64cb8368b12ad2c7be9c8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 4800 bytes
font_01_sfnt_off0000740e.bin
cbada20ebb35fbf98168072dd760d0a5c4962e9303e8471ce326f24889386b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 10136 bytes
font_02_sfnt_off000096cf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CF 4324 bytes

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