Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1b1d01aa4b935c…

MALICIOUS

PDF

39.0 KB Created: 2020-08-20 06:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 503c862bfbf7f75fa92adac52941cdbe SHA-1: a57e05f667414573c55fc8c8b8665384c704a18c SHA-256: 6b1b1d01aa4b935c56d873cb6bdad683c8c58ef905c3c7bb6a5662ebc868de2c
154 Risk Score

Malware Insights

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

The PDF contains a link farm, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=invertebrate+vs+vertebrate+worksheet', which is a strong indicator of a phishing or scam attempt. The presence of numerous other PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

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/pify?keyword=invertebrate+vs+vertebrate+worksheet
    • http://files.thenavigatorprogram.org/uploads/1/3/1/6/131607635/cecdf3384d7c.pdf
    • http://files.heartcraftpaper.com/uploads/1/3/2/6/132682471/984e3a2018602f1.pdf
    • http://files.krmcloughlin.com/uploads/1/3/2/8/132814168/kazujazezug_vasow_kifopikujax_basapudarolijij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/lavepisolona.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/tubokuvopekewokadipikiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/synaptic_plasticity.pdf
    • https://cdn.shopify.com/s/files/1/0435/2632/4383/files/23809407910.pdf
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/agonistas_b2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/13351046974.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0451/0603/6899/files/inequality_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1828/7266/files/1999_chevy_tracker_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/41686500047.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/49967681519.pdf
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/functions_of_modal_auxiliary_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0448/5208/4898/files/type_of_lists.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6241/files/adobe_audition_for_pc_windows_10.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_off00005b28.bin
45bc633cb20916b03d451ca7b786be27fa29e2fc40348bae23713a34742e52a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B28 5036 bytes
font_01_sfnt_off00006c52.bin
5f293e25c977aef01e1bb7397a27d7151aae82f192f13e5547d2f018714442ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 10212 bytes

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