Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b798178d21d5fb8…

MALICIOUS

PDF

123.4 KB Created: 2020-08-10 05:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad7a6973ab1f1b73c30fdb8e194ec8fe SHA-1: e2e8adbc2806f3d3438560efeb39e9023016beaf SHA-256: 4b798178d21d5fb8ea24d54cc0160298914fa1ca498cc525003f18ac02085116
150 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, characteristic of a PDF link farm, with the primary malicious URL being ttraff.ru. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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.ru/pify?keyword=challenger+deep+pdf+free
    • http://files.renewfurnitureonline.com/uploads/1/3/1/4/131409200/f2244db1.pdf
    • http://files.gvtrail.com/uploads/1/3/0/8/130814177/01f9095822.pdf
    • http://files.blissofne.com/uploads/1/3/2/6/132681931/6370523.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/bofigetolopo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/10520224581.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/nowadenuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/vokunebakojodefilusasef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/manejo_amigdalitis_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/4750802283.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/asthma_medications_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/pefedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/walivifedugolazigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/zeguwele.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/92445909077.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/law_of_attraction_the_secret_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7952/files/upadhyay_and_nath_biophysical_chemistry_free_download.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_off0001a6bf.bin
756f53fd844e54745dfea063ce6be01048a80a8b446a679aae34a1692ed29870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BF 5028 bytes
font_01_sfnt_off0001b7d1.bin
f87defed9b526b4f4567663e2229257b278887b3870872253f675b05d879dc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D1 11940 bytes

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