Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec81ab810c13331…

MALICIOUS

PDF

54.5 KB Created: 2020-08-21 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0aa522fd83139cbe084ef91c20b129 SHA-1: 61100fd7fd353b6d1432c35ce787de8abe82d893 SHA-256: bec81ab810c13331e8b6201140523a746ad2ae6705ac05ccdf12e09a07fb960d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body itself contains a URL that leads to a redirector, likely intended to obscure the final malicious destination. This suggests a link farm or redirection attack designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=carols+in+the+domain+2018+performers
    • http://bofub.malagasycotonclub.org/uploads/1/3/1/0/131070054/limapedimuxad.pdf
    • http://mifix.bitaffinity.org/uploads/1/3/0/7/130739664/bozedomebuxup.pdf
    • http://ridumab.catherineofsienaparish.org/uploads/1/3/0/7/130776449/15d7c4c.pdf
    • http://files.kiddylinguistics.com/uploads/1/3/2/6/132683168/2296365.pdf
    • http://tasefewe.niosha.com/uploads/1/3/1/6/131637021/b5aef1ec61.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/fatujasizifojela.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/68209953919.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8526/files/google_chrome_video_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/nilumamadafem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/3976021601.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/govopumuxivumedogumexajim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/44976526714.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/jezovuwir.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/sat_chemistry_formula_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3851/files/c_byte_array_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/54035714176.pdf
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/pixev.pdf
    • https://cdn.shopify.com/s/files/1/0436/6280/3097/files/the_world_of_myth_an_anthology.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/xokotajedepobuzibazav.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_off0000957a.bin
a791f91be053e79c8ca60861454fa7fba0dadeab528492e031a7f0ab5277b016
pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 5708 bytes
font_01_sfnt_off0000a8b9.bin
4f450c07730861d6537f32b798593902b64354226d84130c3dc4ce31833cade4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B9 10420 bytes