Malicious PDF — malware analysis report

Static analysis result for SHA-256 152f9bacf458b3c0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 15:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e001b716b64770dc520bcdfa8e8d241 SHA-1: 6bdcc3c6ac98c9959188bb4e7248810f736f9638 SHA-256: 152f9bacf458b3c0e973ee950ce9b144ef7f06df98db15fd6dc7c98fcc8c8506
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), which is likely the primary malicious payload delivery mechanism. The presence of a 'download button' lure further supports a phishing or social engineering attack. No scripts were extracted, but the overall structure and link farm indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=eraser+apk+versi+lama
    • http://jozapaj.cherylcanterbury.com/uploads/1/3/2/6/132681947/63472.pdf
    • http://vuxavik.alabamabalfour.com/uploads/1/3/1/4/131408970/3392000.pdf
    • http://files.daveevardson.com/uploads/1/3/0/9/130969558/rulifabirapuxiraf.pdf
    • http://files.melissa-haskin.com/uploads/1/3/1/3/131382590/457807e2c7c.pdf
    • http://files.northwoodscanoe.com/uploads/1/3/2/6/132681488/fenozetijubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8497/0139/files/vovebilodebevorogefukuduf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/dilipisuki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9272/2339/files/zetenanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/ethnology_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18396470220.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/70910901873.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/name_for_engraving_done_on_metal_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/50298783056.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/mitovakoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0432/6640/8603/files/29692015720.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/bitopelugex.pdf
    • https://cdn.shopify.com/s/files/1/0438/8320/0680/files/nepalezidipitulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/tupuwatudusamapafinive.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000563b.bin
567301678e7d9bf50d87e1ee9721ab7c34ea7c594c63f39b18fe842b6053dc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x563B 2952 bytes
font_01_sfnt_off000060c5.bin
22f476ab1acb0232927cf228cc16350a60115c5677e79450fb7572f7ea205a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 5048 bytes
font_02_sfnt_off000071e3.bin
57552a84c70e719bf96e13df804f6ac7b4a63aac38daee50d85f73ab971db637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 12432 bytes

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