Malicious PDF — malware analysis report

Static analysis result for SHA-256 da837d762e38f09f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-08 22:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0647593bf45944476420b2ff601bde0b SHA-1: baec285acaad4b6a74c820224e4dc164ebb414db SHA-256: da837d762e38f09f02bf6db2dd5b38de55f37226eac681ecaffaf91137df6679
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector. The document body contains garbled text along with the URL 'https://ttraff.cc/pify?keyword=a+monster+calls+play+pdf', which is likely the primary malicious payload delivery mechanism.

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=a+monster+calls+play+pdf
    • http://files.cybercats5436.com/uploads/1/3/0/7/130739564/panefadufi.pdf
    • http://files.clear-heater.co.uk/uploads/1/3/1/4/131438616/4273705.pdf
    • http://mokulunol.blue-sky-coach.com/uploads/1/3/2/6/132695818/9817270.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/zelibagefakevufexipik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/lujumif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/tuxasalezilorekidon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/zunijimipinifebome.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/68644534064.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/tiriritabidafu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/zifajeladapabodiwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/46245868849.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4039/files/37118725895.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/form_433_f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/biwopolituga.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_off00005a21.bin
fb6315d639135d8f11bd26601d56fe2df1d5e50349d2167f0aa94ead46260066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 5392 bytes
font_01_sfnt_off00006c69.bin
385f10c14ad14da29763db70227ec0c59f630662b62870c6b3a133986c7d3add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 9900 bytes
font_02_sfnt_off00008e8e.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 16092 bytes

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