Malicious PDF — malware analysis report

Static analysis result for SHA-256 da99eb35a7ef59f7…

MALICIOUS

PDF

42.4 KB Created: 2020-08-17 07:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1197186c48ebfe2c8fd1ee9407debf84 SHA-1: 0261bd9ee7eb4454f81ab2a8d965a3a9d2106ba3 SHA-256: da99eb35a7ef59f7e1fd6bb38a59d3b06aa2013440859090d535efc94e47bf10
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=without+graphics+card+games+free', suggesting a lure related to free games. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous links to other PDFs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=without+graphics+card+games+free
    • http://files.puretransformation.net/uploads/1/3/1/4/131437119/76fb7e3a.pdf
    • http://files.newburgfcog.org/uploads/1/3/2/7/132740260/mojujirizilepi.pdf
    • http://files.macksoftware.com/uploads/1/3/0/9/130969801/muredep.pdf
    • http://files.amarilloparties.com/uploads/1/3/2/6/132683140/wejusa-tevuniganovita.pdf
    • http://vowidojo.dianasofiaestrada.com/uploads/1/3/2/6/132680813/7726063.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/24935478170.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/romones.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/vasujetabukepegovuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/download_buku_kamus_bahasa_arab_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/reference_harvard_style_generator.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/margaret_atwood_biography.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/nujatexives.pdf
    • https://cdn.shopify.com/s/files/1/0434/4768/1191/files/kendo_ui_dropdownlist_template_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/sunopupojelovizavaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/all_bollywood_film_box_office_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62856854762.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/beef_jerky_nutrition_guide.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_off0000660f.bin
79e38cd199452f07a07d012d95fedce7da3478e7f52ff455e84a43ed697eb76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660F 5552 bytes
font_01_sfnt_off000078da.bin
a2c226015b82e6c4626a3682ff24b5f90121a4fd8c36ee1f0e3ba75b9d9bfe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DA 10512 bytes

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