Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c13144587338c…

MALICIOUS

PDF

33.4 KB Created: 2020-08-30 15:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8be5e8ca9173f0b712f93a38a5086151 SHA-1: 126ac1ac100d7984f01ccb233b1b47ec1ff55411 SHA-256: 128c13144587338c7d4ff4af1f263f88d0f45bb41f96a89f15572a66522a1bf2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure the true destination. One critical heuristic identified a link to a known malicious redirector at `ttraff.com`. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful content.

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/wix?keyword=diccionario+de+lengua+de+signos+espa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/blue_bird_naruto_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/vumukakokuwuzawefor.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/26839795348.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/dufixorizegajetedejatowog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/whatsapp_plus_apk_v6._80_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/microscope_parts_powerpoint_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4885/files/48711852324.pdf
    • https://cdn.shopify.com/s/files/1/0435/4437/9546/files/95783802656.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/71528449009.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/types_of_belt_conveyor_systems.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/gibukadodomegugifuzamun.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/4262157550.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_off0000431a.bin
7370f45d0b4105154cded680000471374682eef27188e50755f4ca90d9f9d298
pdf-font-stream PDF embedded font (sfnt) at offset 0x431A 5240 bytes
font_01_sfnt_off000054f5.bin
0a0ae07eb3f27b5cae6a36e87490b7351a4abc26e3194a59fd69ec9c723e505f
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F5 10568 bytes