Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d319c3c5b380751…

MALICIOUS

PDF

49.2 KB Created: 2020-07-29 21:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2f40785a0f245b32352675bf51a16b SHA-1: a22a96d04a6d6f8096efca0466e2c61584920759 SHA-256: 4d319c3c5b380751215e35020f0f17c7899d9e75f9902b0ddb263bc75c80b9ae
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify-hosted PDF files, indicating a link farm. One critical heuristic specifically identifies a malicious redirector link, suggesting the intent is to lead users to harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=english+words+for+grade+1+pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.barrystaxidermy.net/uploads/1/3/1/4/131438477/16f3db7775.pdf
    • http://files.mbcslidell.com/uploads/1/3/0/8/130813111/2492453.pdf
    • http://files.barrystaxidermy.net/uploads/1/3/1/4
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/24221737786.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/86923934987.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/dusovajonedenud.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/goxelaxusakuwujibajek.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/45997412948.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/31720146201.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/75984473031.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/51383496236.pdf
    • https://cdn.shopify.com/s/files/1/0433/4246/3126/files/61390005078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b33.bin
7edce4d95803d340834bd74b13a28aebb5d2ec92fa827c20a397b5fe8454d04e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 5112 bytes
font_01_sfnt_off00007c9f.bin
9aab7bc8bb24e96eb92b46b586b37061c9a6fa37dbf2a7c34e7849b340acaa96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9F 9848 bytes
font_02_sfnt_off00009e89.bin
607a24338066f6f1176b3dcda8bb673f1ed75a5016fca7efea2857c6159902f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E89 17284 bytes

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