Malicious PDF — malware analysis report

Static analysis result for SHA-256 8976d74dac1d162a…

MALICIOUS

PDF

47.7 KB Created: 2020-08-30 15:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3586e479e2f14b0ed9a6398d4c7866c SHA-1: 056630ab76a57a51c744dcff14afc7103aa55950 SHA-256: 8976d74dac1d162a4553efe2aec0385bbb05387f11c291d71f88ee801c2275cf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it is a malicious redirector link, pointing to `ttraff.com`. This URL is embedded within the document body and is designed to lure users to potentially malicious content. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=ccna+2+chapter+7+practice+skills+assessment
    • https://static.usrfiles.com/ugd/b8c837_dc39c6ddc732468aa0b64909ba3bb54a.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_2854ce1040ff49f48d4c0812ddddb16f.pdf
    • https://static.usrfiles.com/ugd/cafc24_627115c515434c9b834e349d88b94cdc.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_a8a8304ee4b0460bb79c06acd12b93e9.pdf
    • https://static.usrfiles.com/ugd/1c90dc_6c3e3d8028c4423097568b67fcd52ddc.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/science_grading_sheet_deped.pdf
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/bjp4_self-_check_2._21_count2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/create_drop_down_box_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/letusolufafabukuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/98006799231.pdf
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/aapc_official_cpc_certification_study_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/guxigobokuvowositosujiluz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3791/files/43786296829.pdf
    • https://cdn.shopify.com/s/files/1/0454/2418/1416/files/norazejumofumozegoved.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672d.bin
e10381c183f1575eb2b6c41364d305e5b66ba924907795ac7f5e4e06227e1b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672D 5152 bytes
font_01_sfnt_off00007876.bin
d2b9f4befd9c6d4551c5c225b8348c63a1ad6c429bd5a8cdb3bd98f8405d918f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7876 14000 bytes
font_02_sfnt_off0000a407.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA407 4324 bytes

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