Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3410425731a850…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 09:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7f16015e9934ed614345840642def0 SHA-1: 561b48eea868e7920e9a0d05600d7c915f551b0f SHA-256: 6b3410425731a850d6d240def66816f760f8e9ac327306693ae56271f12479dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One of the primary links, 'https://ttraff.com/pify?keyword=easy+biscuit+recipes+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing recipes.

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=easy+biscuit+recipes+pdf
    • http://files.leslie-marshall.com/uploads/1/3/0/8/130814492/3105372.pdf
    • http://files.jalcinstruments.com/uploads/1/3/1/4/131453151/70782.pdf
    • http://files.shatteredpec.com/uploads/1/3/0/9/130969430/8978000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/99015104389.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/stratego_rules.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/types_of_audit_report_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/82722463808.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/adams_tax_forms_helper.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/1957_ford_f100.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/mumufixokegusovaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/electric_start_weed_eater.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/74774381373.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/11276888094.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/vavanutibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6076/4576/files/79625907357.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/58165955038.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_off00005f4f.bin
e3caca54fb5720342c8d0f4d7f77cf206f8cef4802faa078e26b7776f7600c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 5316 bytes
font_01_sfnt_off00007179.bin
8c245b5a78fd4180f196b17d30c3453b8a3196f862ee299b9d1cd5d60f1bb926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7179 10072 bytes

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