Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93025a650bd0105…

MALICIOUS

PDF

41.4 KB Created: 2020-08-19 19:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b38b7be59ffb331ff0016bd4b0a0cd3 SHA-1: 141aeb333aaaee315700a7db31157adafd299296 SHA-256: a93025a650bd01050a5a4f636b6673cf8e3cecd6e20c38c96c2ad03d17ff586b
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution site. The document body contains garbled text and embedded URLs, reinforcing the link farm heuristic.

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=suara+burung+nuri+hitam
    • http://files.waterislifebeads.com/uploads/1/3/2/7/132740204/xumabi.pdf
    • http://files.greenlightbikes.org/uploads/1/3/0/8/130873787/fatelexelewavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/catalytic_naphtha_reforming_process.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/70164170471.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/36767618008.pdf
    • https://cdn.shopify.com/s/files/1/0446/7235/2419/files/lord_of_the_rings_minecraft_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/39939932686.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/80722758577.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/guroto.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/birakadesov.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0293/files/11102590390.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/nutritional_value_of_coconut_water.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/zadapatofokugigarorokifef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/suxajejub.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/74537720352.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_off00005d35.bin
57a27ee7ed24ce65c4af9c45fdf15540e3c5139d4c298e23acda850880b3eb9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 5132 bytes
font_01_sfnt_off00006e7b.bin
436e33ad63a2034bd636e4db5afef1f514570a993abc01c57fa7ff11585b690f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 13556 bytes

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