Malicious PDF — malware analysis report

Static analysis result for SHA-256 5645cd8d4dbcdb35…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 05:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f942b671547ee51d6e14a6f6cf8db94a SHA-1: 3d901bf65ca109644662030f4ae6b5b7625f33a5 SHA-256: 5645cd8d4dbcdb350bad05d695b6bedf806e9e60ee6a375835a1682c65668ca6
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link, https://ttraff.cc/pify?keyword=anger+management+samhsa+manual+pdf, is identified as a malicious redirector. The document body, though partially corrupted, also contains this malicious URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing a "anger management samhsa manual pdf". 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.cc/pify?keyword=anger+management+samhsa+manual+pdf
    • http://files.milkshedcatering.com/uploads/1/3/1/8/131856331/dejab-fosopiler-lemoremagi-soraligonad.pdf
    • http://files.closeandpaschalauction.com/uploads/1/3/1/6/131607063/8792964.pdf
    • http://files.innuan.org/uploads/1/3/0/7/130738504/resop-dilatidaramelup.pdf
    • http://novamar.anstrutherlifeboat.org/uploads/1/3/2/3/132302782/vosimuwunadewova.pdf
    • http://files.cardenarborview.org/uploads/1/3/0/8/130874125/bulimegefotevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2507/2282/files/surovid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/59814468970.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/wuvolew.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/83841018980.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/bimemajakifutaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8734/files/100_carols_for_choirs_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/xadamafilorowanut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/zeleniluzizenefuripogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/61825409466.pdf
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/78742460442.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/bsc_physics_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/46775664891.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/31830099832.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/
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eba.bin
2afebcdb606ebcec9eeff91cae0e43bf31ec8148c3ca807d8c2a2c38e7625531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBA 5444 bytes
font_01_sfnt_off00006112.bin
83476412a1a1ff0f40f0c97247943c1cb3db809ef5eba46260d44a53c1aceb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 9728 bytes

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