Malicious PDF — malware analysis report

Static analysis result for SHA-256 e750c5a5aa9cb038…

MALICIOUS

PDF

86.7 KB Created: 2020-08-09 09:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ec7a982b2c6f1dbba9b5612cb36b69 SHA-1: 27cdd37ff819757e7c92f036a7108ce5a5d30679 SHA-256: e750c5a5aa9cb038af2773297f9aecf87a9da99670ed44fd53b928cd27834465
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=meningitis+viral+y+bacteriana+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDFs hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=meningitis+viral+y+bacteriana+pdf
    • http://files.motherlodemontessori.org/uploads/1/3/1/4/131453260/6479964.pdf
    • http://files.nprents.com/uploads/1/3/1/4/131438062/woxonugub.pdf
    • http://files.spjcanalfulton.com/uploads/1/3/0/7/130776346/82b72d704d2a2f2.pdf
    • http://files.stjohnsstafford.org/uploads/1/3/0/8/130814115/2512.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/59929478005.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/the_autocrat_of_the_breakfast_table.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/factorio_7_to_4_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/dinobufinovima.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/pafapilikewugaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/rengar_masteries_s7.pdf
    • https://cdn.shopify.com/s/files/1/0436/1352/0029/files/931868197.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/tixapalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/city_of_endless_night_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/regile.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/67767044015.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/rowoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/bivot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3765/files/munesopawudadilizub.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00011988.bin
f8bcd88988dbabd4a8a7c3eedd83fe3f3812f08b167026499d5d1cf3c5b46180		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11988 21632 bytes
font_00_sfnt_off00009e31.bin
dffb116d83bdbfc08ae97df7bfea4e9b8a556d0880c0e3e7b1a4417471040b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 7564 bytes
font_01_sfnt_off0000b809.bin
308de9bd3badd24241f35c5931272c40e3f35923edfe58125ef135b11642d02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB809 5632 bytes
font_02_sfnt_off0000cb56.bin
b1db8b17daea54a686a16abf47085c72f02ad5efdc7034e7e52faf3fd7196833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB56 7984 bytes
font_03_sfnt_off0000e17c.bin
c4620a0c110af6afa3bd218ca5b371c29aacc2d91a2ba2c21e221f56f758907e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18804 bytes
font_05_sfnt_off00013e5a.bin
211b35ef3c08a56e06e21780cbf1e3bf65c9dcf255c4ba896b5b57c0d4fc48aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 3440 bytes

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