Malicious PDF — malware analysis report

Static analysis result for SHA-256 163789790b40cea1…

MALICIOUS

PDF

42.6 KB Created: 2020-08-03 15:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3751affb5fa5c46d9ea1fc8929ddca61 SHA-1: af6946cfbdf0d684fd03b253047040760b815bf1 SHA-256: 163789790b40cea1ee63722b2f6219c05293065c3deeb9f0e0242d39b0e915bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.cc/pify?keyword=elastomeric+impression+material+pdf, which is designed to lead users to potentially harmful content. The ML classifier strongly indicated maliciousness, supporting the presence of these redirector 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=elastomeric+impression+material+pdf
    • http://sogevo.vellturocounseling.com/uploads/1/3/1/8/131872269/d527dea7973a775.pdf
    • http://files.oscarpalaciosarchitects.com/uploads/1/3/1/4/131406435/wevigofuz.pdf
    • http://files.ocalaqueenofpeace.com/uploads/1/3/2/7/132740925/vaxoloma.pdf
    • http://files.desert-green.org/uploads/1/3/1/8/131856034/wilitatoxagaw_zusalozejunepa_mebod_sugidefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/count_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/cen-_tech_digital_multimeter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/zovevanufuxowudezixej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/vawil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/jolodebolozutogulutak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/ladutonekorimomanubiturim.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/how_to_put_music_on_ipod_nano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/an_introduction_to_analysis_wade_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/87958157436.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/wezawasan.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/34920182612.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2817/files/25084224310.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683a.bin
e037ea0a2b54ccefb2823e4727f3d4bb63737d03f62598bb7b2efcf196914555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683A 5256 bytes
font_01_sfnt_off00007a0a.bin
4578be5082423c09107845de23e068fd6fe50ab3a7e4be61bfcd44210ad5ab65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 10412 bytes

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