Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7f290edbd4060c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 05:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa8da174e059f744890c89c3b6bf596 SHA-1: 77ae3c799e11f3387dc57133132b8728cf61ffcc SHA-256: 8f7f290edbd4060c84571ff695830a8602523178b65130dca63086bf7a4a34df
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.cc/pify?keyword=inteligencia+naturalista+caracteristicas+pdf' is likely part of a phishing or malware distribution chain. The document body contains obfuscated text and references to the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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=inteligencia+naturalista+caracteristicas+pdf
    • http://wojaje.jamesdykman.com/uploads/1/3/1/6/131606289/f8fa83ad2fcd.pdf
    • http://jodexomi.dartmouthcollegemsa.com/uploads/1/3/0/8/130813528/tepivuwolipotox.pdf
    • http://files.futyfoundation.org/uploads/1/3/1/3/131398134/2c54c9fb8.pdf
    • http://files.assembly2237.kofc.com/uploads/1/3/1/4/131437711/07286ab05.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/pemazuronapukizumubir.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/40615031620.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/jinekizusologujom.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/36731115263.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/velejurivupojuvumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/windows_7_pro_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/57428413480.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/menewit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/44291502991.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/34780415319.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/85489255854.pdf
    • https://cdn.shopify.com/s/files/1/0432/7607/5164/files/color_by_number_addition_and_subtraction.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_off0000735e.bin
7a85122645e918c207403ae3194609749dd6b50144cedacda6ac3ce1e34b459a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 5260 bytes
font_01_sfnt_off00008553.bin
676e7d72190bbac38c16e87d63163ab82c9d77ade4b0dd736cbf260a9fea2025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8553 11068 bytes

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