Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bdb8555549d98d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 00:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e3c18ff935e7302a9adccc4d053d99 SHA-1: ae9c791d7907b34fbfe8dd7b6554625def96813b SHA-256: 11bdb8555549d98da2baab4930073a64528c069758390841a171e340a9ccf744
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm designed to distribute malicious content. One prominent URL, https://ttraff.ru/wb?keyword=fingerpicking%20guitar%20for%20beginners%20pdf, is identified as a malicious redirector. The document's structure and the presence of these links suggest an attempt to trick users into navigating to malicious infrastructure, likely for further exploitation or phishing.

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.ru/wb?keyword=fingerpicking%20guitar%20for%20beginners%20pdf
    • http://files.mkrishnan.com/uploads/1/3/2/3/132302963/lizewenaxero-zozarinipovefu-josapo.pdf
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdf
    • http://bukeratef.smallflute.com/uploads/1/3/1/3/131380999/sepijafebuz.pdf
    • http://bezolaliw.nuancedtranslations.net/uploads/1/3/0/7/130775189/0f4e392c49e864c.pdf
    • http://files.dennismemoriallibrary.org/uploads/1/3/0/9/130969352/1994221.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/raavan_enemy_of_aryavarta_amish_tripathi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/75857221149.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/sigolugijutotumizajo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/83264980962.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/57119826509.pdf
    • https://cdn.shopify.com/s/files/1/0448/1341/8662/files/vampire_the_masquerade_bloodlines_clans_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/axillary_artery.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/zekaviwebozababe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/75787667620.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/cloud_atlas_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/2533/8265/files/render_html_to_python.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006803.bin
0bbb5927b56d227223a47f1f666a9e3e3720abe56d774900656e81c68d118467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 5452 bytes
font_01_sfnt_off00007a90.bin
76b5375e6aa0a0193efc3bd3f5bba2fd222a6e86eb5281564f75f8b2bbc72333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A90 10100 bytes

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