Malicious PDF — malware analysis report

Static analysis result for SHA-256 b530cf55a368b5ef…

MALICIOUS

PDF

44.0 KB Created: 2020-08-05 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c9651bab5ab348eda7160cecc228ecb SHA-1: 1e1dd685a6f060a8f632a90d073beda9f71845e3 SHA-256: b530cf55a368b5efcfc3d9c5da1abbdeeb54931362ad8007750891537c7e2441
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a malicious redirector on ttraff.com, disguised with a "creative writing prompts worksheets pdf" keyword. This indicates a social engineering attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=creative+writing+prompts+worksheets+pdf
    • http://files.gracewalkfarm.com/uploads/1/3/1/6/131606169/e6be8.pdf
    • http://sateven.quantumenergetichealings.com/uploads/1/3/2/6/132682883/gawikixolagegu_zimozidaze_sanixibu.pdf
    • http://files.frs.com/uploads/1/3/1/3/131398555/gitonaxageko-xuwarigazeto-zarerapetop-dovufojuriropu.pdf
    • http://files.americanheatingmn.com/uploads/1/3/1/4/131407135/beruliwowuki.pdf
    • http://files.quinnfarm.qc.ca/uploads/1/3/2/6/132695416/7020177.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/67941320751.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/sunavegamapuzugofuxujil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2527/files/lugadetodegilonuropew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/perepanekapugewisis.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/vukobugonodopir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/begilolizapi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/25770793485.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/61196255958.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/30371757754.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/sesitizog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/12160889652.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/xefik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/nulexil.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_off00006e3d.bin
85c2e6939c698ed9818d8760a673e5b6b00ae6b32e6eff47237f4ebc3694c4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 5544 bytes
font_01_sfnt_off00008107.bin
613cd715de153a6b5e296b7e32425325ff5fbd09e8e93ef60a40273dd84432fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8107 9932 bytes

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