Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a84a0458e6cbf9…

MALICIOUS

PDF

40.2 KB Created: 2020-08-03 21:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 019130b35cee31d6f97f8f7711ced011 SHA-1: a1d5e67e729ec1c563adcadf857ad3cfafe5b13a SHA-256: a2a84a0458e6cbf917807c56d81847ebcf114b2b6388cb5f474675cc739b3e84
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL leading to a known malicious redirector. The document body, though malformed, contains text related to advertising strategy and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=advertising+creative+strategy+copy+and+design+free+pdf
    • http://files.johndollar.org/uploads/1/3/1/8/131858661/d1a59642b96ea5.pdf
    • http://files.college-boundcoachesnetwork.com/uploads/1/3/1/3/131378816/sozewa.pdf
    • http://files.breakpointny.com/uploads/1/3/1/3/131383743/90ef2dc1fc3.pdf
    • http://files.adamwilliamchalmers.com/uploads/1/3/2/3/132303359/nolekorabib_fekedekasa_bibubi_gazaj.pdf
    • http://nukowon.alexsarkisian.com/uploads/1/3/1/6/131606727/fesigakeluje.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/62386310993.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/ragikuma.pdf
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/kevinaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/3012293386.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/it-_2663_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/quest_list_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/32760217236.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/pulujujanibavawutojifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/18010068540.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/gemadumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/kuvadagulu.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_off00005f8e.bin
e9c6e3c7d28c87b12e01a137169ee56cdcdbf1f85421d609ab4b7f0bd487ef80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 5444 bytes
font_01_sfnt_off00007234.bin
a9ce5155f37c1d75fd5d5414f98d6947743c08035114895c0f7a954bea05de22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7234 9732 bytes

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