Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897f8b561ffa7f1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 16:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d556f09926a2eecdfbf6b4236c2be675 SHA-1: 972d2c2c0a8e15b6eb02758a1cd3f017cc78412b SHA-256: 6897f8b561ffa7f1f91b6a6529a14b8b2734e5b888c0e31b829b1c275a5181bf
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, identified as a PDF SEO link farm. One of the primary links, https://ttraff.cc/pify?keyword=common+core+algebra+standards+pdf, points to known malicious redirector infrastructure. The ML classifier also strongly flagged this sample as malicious. The file's purpose appears to be directing users to potentially harmful websites.

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.cc/pify?keyword=common+core+algebra+standards+pdf
    • http://files.tendersolesfarm.com/uploads/1/3/1/4/131411596/1669708.pdf
    • http://files.kacylatham.com/uploads/1/3/0/7/130775982/9563754.pdf
    • http://files.lavwcd.com/uploads/1/3/1/3/131398541/sibekigusew_pufefanapu_gulalelu.pdf
    • http://files.suzannewittfoley.com/uploads/1/3/0/7/130739069/6a61479a4.pdf
    • http://files.cheerproathletics.com/uploads/1/3/1/4/131407274/9305155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/delco_radio_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/dunaxetas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/sudigexof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/45846393435.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/39649238174.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/damagozajokitepetow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/92841955947.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/draenei_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/dinowef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/48786389412.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dda.bin
96bc69cfd7403ad8262380e79c3cd9718a4b575e66eff2e33dd302d456a78aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDA 5520 bytes
font_01_sfnt_off00007078.bin
752e13eec46d70f9e767a4424f06d3e3811a22908d0930e552b3995baee028a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7078 10144 bytes
font_02_sfnt_off00009360.bin
9f4914eee661b0ee52b7d56f83ca1c0c111f1c5d0cc5f10efe511803eb69212c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9360 16176 bytes

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