Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f197208b060e26…

MALICIOUS

PDF

42.4 KB Created: 2020-08-31 10:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15f3f1f6a6f8fa855c7850f99285cc7 SHA-1: 68ced9a00df1409162ac7eba4f695787a407af48 SHA-256: c2f197208b060e2683dfeeda3c607a3284aed77b3ea44972045fd36cfccb60bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document with high confidence. The document body contains garbled text but also includes the URL https://ttraff.ru/wix?keyword=samsung+messager+touch, suggesting a lure related to a 'Samsung messenger touch' service. The presence of a link farm heuristic further indicates a malicious intent to distribute malicious content.

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.ru/wix?keyword=samsung+messager+touch
    • https://static.usrfiles.com/ugd/fb83f1_6ad36013445d4e8193808acf13745510.pdf
    • https://static.usrfiles.com/ugd/b8c837_1424bd56622a4d56a1e2ca8feeba0a69.pdf
    • https://static.usrfiles.com/ugd/b8c837_c50f183c9fe44bb6acd7e49a53666537.pdf
    • https://static.usrfiles.com/ugd/5b604d_e3f107a481dd485dbf3512a3b7b07464.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0ec26aa718448389c47cdf6d60a2cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9eace22d32914984a2f7a99007a56742.pdf
    • https://static.usrfiles.com/ugd/e3c460_16e8a7a696764160a08ebc81e460a6ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df74262b403471d8adc9018a728f5bf.pdf
    • https://static.usrfiles.com/ugd/b910ae_c6eb04a51a9e472093b96b05a9efdec3.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/nadesotog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1767/files/how_to_shrink_a_file_size.pdf
    • https://cdn.shopify.com/s/files/1/0450/2398/5828/files/letojafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/bmat_section_2_assumed_subject_knowledge_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/amharic_alphabet_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6932/files/not_so_bot_invite.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/california_dmv_driver_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/71729214337.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_off000067f7.bin
8ede6b8cc8cf68c0828aa64668a1f1650de8f7212baadcb5ab85da9247e5f82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F7 5284 bytes
font_01_sfnt_off000079ba.bin
b33d3cc14b32fdf990682fe8f9b453aabcc1be0b7d90f561fafdbaf5b9f838d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BA 10180 bytes

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