Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c83bb17743455c…

MALICIOUS

PDF

49.4 KB Created: 2020-08-05 14:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ffcd2327125bdf17dab08323535eb5 SHA-1: d085241519b3c4d78ca5632b3679d4bfa205ab98 SHA-256: 33c83bb17743455c9e4501665fc3dca577ad01cca79abe6c4e0115db8452af1e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to host further malicious content or phishing pages. The PDF also features a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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=calendar+2020+pdf+malaysia
    • http://files.worlds50bestsushi.com/uploads/1/3/1/3/131381112/f144341.pdf
    • http://tuxujekij.leahcarolinejones.com/uploads/1/3/0/7/130738731/betutezabomude_xiwuz.pdf
    • http://files.westwoodchristianchurch.net/uploads/1/3/1/3/131383791/b735d9356a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/21605026084.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/8554073545.pdf
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/wajifisavevaweruzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/dajimafemumadada.pdf
    • https://cdn.shopify.com/s/files/1/0437/3954/5761/files/sudupegusupemifolafigivur.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6762/files/bsc_academy_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5408/files/borezolex.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/21049822561.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/p_value_formula_excel.pdf
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/22268472470.pdf
    • https://cdn.shopify.com/s/files/1/0440/0375/4142/files/jackson_ky_weather_radar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/curvature_k_calculator.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_off000066d0.bin
bf78f49e877e66cb5c03474bff78993d63ea5496d4ba1011657880b820387bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D0 5468 bytes
font_01_sfnt_off00007955.bin
16e88900a5b04cf4fb596c493997b4203379b1b2af740d8a62a372215019e511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 13648 bytes
font_02_sfnt_off0000a384.bin
32f4f1f0b695e5d4615fbcad4b5b3a29e2120f680b26ad6392bb678d83ba1141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA384 16108 bytes

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