Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bbbe295258595d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-13 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100d2d45c6b35f135b5ea7c5295e8a96 SHA-1: b91e3620dc4154554d03986e658668342269db49 SHA-256: 98bbbe295258595d44cea77a63f8c1e8ccc864b5e23fdb2b550ab8ee97883e3d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, masquerading as a worksheet answer key. The primary malicious URL identified is https://ttraff.com/wb?keyword=missing%20angles%20in%20triangles%20worksheet%20answers%20snake. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link-farming SEO tactic to distribute malware.

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=missing%20angles%20in%20triangles%20worksheet%20answers%20snake
    • http://files.jbirdmultisportcoaching.com/uploads/1/3/0/7/130740625/valof.pdf
    • http://fipoj.jeffswaterconditioning.com/uploads/1/3/1/8/131871721/lajokanusenosu.pdf
    • http://lipebev.goodnesstogocatering.com/uploads/1/3/1/3/131398455/7301333.pdf
    • http://files.katebraithwaite.co.uk/uploads/1/3/2/6/132682989/sinolexivibi-novox-kovuwefelazu.pdf
    • http://xafozise.lisajenningsyoung.com/uploads/1/3/1/8/131871721/guwodidokiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4463/4773/files/dogijagegexefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/33556859205.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/89343894331.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/unity_rotate_camera_with_mouse.pdf
    • https://cdn.shopify.com/s/files/1/0437/5733/8776/files/sdl_hello_world.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/miwubarorazezaso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/pexomabizelezorim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/52089533561.pdf
    • https://cdn.shopify.com/s/files/1/0444/3412/9062/files/2386137829.pdf
    • https://cdn.shopify.com/s/files/1/0432/8695/4140/files/9664246784.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_off00005faa.bin
9cec940667ecb4e2fc4ddc78c15f0faacf61a18d0a5dd120e9504b7575452cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAA 5108 bytes
font_01_sfnt_off00007112.bin
6d6c1314b1ddc68d0ea737f3eb9353b1b3728c862eaf918143cf1ef309c17e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 3128 bytes
font_02_sfnt_off00007dd6.bin
1963dd69571bd7fc07fbae5079e41b0a0554f7fe904fbefd43ffc3435d24e7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD6 10380 bytes

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