Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9119a6f39abe90…

MALICIOUS

PDF

40.0 KB Created: 2020-08-15 05:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134f282d2a18a9bafbb7ec64299cb07c SHA-1: 41a05b6439ca159643b68c1dd49f146b3b8c2747 SHA-256: 8e9119a6f39abe90c7d358107d704e6f74cb9cbbd2e9e6803e0eb8ba1dc736f7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.com'. Additionally, it features a large number of embedded links to other PDFs hosted on Shopify, likely part of an SEO link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through deceptive links within the document.

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/wb?keyword=manuale%20scaldabiberon%20digitale%20chicco
    • http://files.joannapickering.com/uploads/1/3/0/8/130874676/bunegiwaba.pdf
    • http://zevoloki.mandevilleelementarypta.org/uploads/1/3/1/4/131407406/kudonav_fifomip.pdf
    • http://junovifu.iwpakistan.com/uploads/1/3/0/7/130775380/f0989511aff.pdf
    • http://kivoron.jocabako.com/uploads/1/3/1/3/131398591/serixofal_zitofugaxajisax_bomegitiresiri.pdf
    • http://zofin.transformineducation.org/uploads/1/3/1/4/131411688/pijigibinajoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/90174544295.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/zuvotibuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/44393665174.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/49231668005.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7435/files/66364779309.pdf
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/rakepexalamuler.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/recipes_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0432/3472/1959/files/random_emoji_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/romobozewalegax.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/jozisevosiwasusuwetoputig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8449/6550/files/46120789027.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/comment_devenir_un_bon_agronome.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_off00005c34.bin
0abe54b2597a73c01a9e1b1eab94b18c5f6951ee4ca4ab13771c30d567305e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C34 5344 bytes
font_01_sfnt_off00006e4e.bin
4cfaaf80565a54315d364d45938cc5f65892542ce50b4746f292f189a6842e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4E 10888 bytes

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