Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ff719b02d05492…

MALICIOUS

PDF

42.1 KB Created: 2020-08-19 07:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd5229eeca1cc335d410f7f7e0e138af SHA-1: 0b3d05c028faa8268a0dc6644ab83d1b3ce6251e SHA-256: a2ff719b02d054920e425fa0a6a6eb2ccc2d179817548e3be1d34d0c63d87527
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Fourier transform coefficient calculator' and the malicious URL, suggesting a lure to a scam or phishing page. The ML classifier also strongly indicated maliciousness.

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=fourier+transform+coefficient+calculator
    • http://roxof.buyhempoilnow.shop/uploads/1/3/2/6/132680813/9209540.pdf
    • http://xowipik.saintmarysconventchiswick.org/uploads/1/3/2/8/132815028/pisijunata_xalalubafatiwuw.pdf
    • http://resofa.leadagency.org/uploads/1/3/1/3/131398455/fd0c44a0.pdf
    • http://janak.buckmaryorkies.com/uploads/1/3/0/8/130814328/334d1092f0.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/12962434886.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/twice_cheer_up_album.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/82632016967.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/bengali_books_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/6156/5850/files/shangri-_la_anime.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/7007620849.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/puzazetixanepubuzuxixotam.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/gonogafigovenabudepimabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/28585249624.pdf
    • https://cdn.shopify.com/s/files/1/0450/1107/5222/files/zeburimozepazowef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/fedex_freight_bill_of_lading.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/95792128268.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_off00006826.bin
cf579598b927aa9fcfa9feb18245a2435338c0254c65f749d425d2386326ac2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6826 4980 bytes
font_01_sfnt_off00007903.bin
2189efd8458541380069871085cfd8bbba768ad0bda87f4c3d3efbfd4f414e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 10068 bytes

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