Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e4a16b726b9b1b…

MALICIOUS

PDF

35.1 KB Created: 2020-08-14 05:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ae0fe2baa0c474ce6131fc668e5a50 SHA-1: 25d40ac246736fc4d7fae230cc3425919902be39 SHA-256: 20e4a16b726b9b1b4a37a8e1d8fbbf0203152bf8ac685a557efe4a0c60e4c81f
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=problem+solving+worksheets+for+kindergarten`. This indicates the document is designed to redirect users to potentially harmful content. Additionally, a PDF link farm heuristic suggests the document is part of a larger SEO manipulation scheme to distribute malicious links. The document body, though partially corrupted, contains references to the redirector URL and other URLs hosted on Shopify and custom domains, some of which are flagged as benign but others are unknown.

Heuristics 3

  • 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.
  • 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=problem+solving+worksheets+for+kindergarten
    • http://files.twosisterscandy.com/uploads/1/3/1/4/131407647/4503ec.pdf
    • http://files.maderavistatownhouses.com/uploads/1/3/1/6/131607712/67ccb1825f.pdf
    • http://files.craigheadcountyveterans.org/uploads/1/3/1/4/131438274/zikarotijuva.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7748/files/mokakabomokujawukix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/87471806153.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/google_sheets_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/fixokekiranomasakuni.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/juwodaduwuxeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/71108163178.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/genawudep.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/synovial_fluid_composition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/xotegebiguteji.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/beps_action_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/alcohol_phenol_and_ether_ncert_solution_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/zuzizegopuwabulisibutik.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/21946307383.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_off00004ac8.bin
80f64223506ddfdce2c4a4f7f394c97535e465ae4a27f549b46041cc21ff86ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC8 5676 bytes
font_01_sfnt_off00005df4.bin
01189c122252ec31c49c65fef83807d7d3e8d5a0a305a2c4f5d3a527900601fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 9856 bytes