Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d515cbfdb462154…

MALICIOUS

PDF

38.9 KB Created: 2020-08-22 01:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98fe4959631505be2101251bdcfac0d9 SHA-1: 18961ecbc660cefa9008b73efe4de09e145b67d4 SHA-256: 8d515cbfdb462154149843c7ce434b6470d0a04c81816bbb9111351a6be8f4f5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=calculation+colour+by+numbers+worksheets'. Additionally, it features a PDF link farm with numerous external links, many hosted on Shopify. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains text related to 'Calculation colour by numbers worksheets' and the malicious URL, suggesting a lure to disguise the malicious redirection.

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.ru/pify?keyword=calculation+colour+by+numbers+worksheets
    • http://kuwifoten.percybio.com/uploads/1/3/0/7/130776819/roborupigon_kajabuf_sumumu.pdf
    • http://pemuf.marciasesthetics.com/uploads/1/3/1/8/131856190/35df99.pdf
    • http://fogirizax.mitchadvent.com/uploads/1/3/1/6/131637046/tajujisokifa_gojedomobeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/autocad_2d_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0437/6952/8471/files/gofejavelisijusir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/93251230200.pdf
    • https://cdn.shopify.com/s/files/1/0448/4068/1633/files/sixadawafuxutaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/21932850646.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/70398368348.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/buku_panduan_belajar_bahasa_mandarin.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/nuzalifag.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/small_is_beautiful_francais.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_off00005a9e.bin
dda4267266fc76d0f626bdb3be292b8b147fe91efda67d7cf761b361b36c5eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9E 5344 bytes
font_01_sfnt_off00006caf.bin
36804feaf3159922e48a1d399626973c1f30aeb5a6776f1b06bbba5c976184c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 10072 bytes

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