Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7bdd38bde3fe76…

MALICIOUS

PDF

49.1 KB Created: 2020-08-12 14:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331cb3a70855a4e087bc06c6f90d5dec SHA-1: 77199182a6410fecc5cdad44763f8e912e5df297 SHA-256: 1b7bdd38bde3fe76d04ec06fbb0da3bb118d922a1714235875756d9709011392
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=leave+letter+in+english+for+school+pdf'. This suggests the document is designed to manipulate search results or redirect users to malicious sites, rather than providing legitimate 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.ru/pify?keyword=leave+letter+in+english+for+school+pdf
    • http://files.schombergcommunityfarm.ca/uploads/1/3/1/3/131380868/c3c31a37f78ec7.pdf
    • http://files.glasskicker.ca/uploads/1/3/1/3/131398145/165efa.pdf
    • http://files.nicoleadriennephotography.com/uploads/1/3/1/4/131406390/xusurajatelakog.pdf
    • http://files.mrsbrandal.com/uploads/1/3/1/4/131437563/1771627ae46a59a.pdf
    • http://sutob.suppliedfromchina.com/uploads/1/3/2/8/132814930/xalitofiletipazus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/2013_nissan_rogue_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/benchmarking_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/83882465982.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/89270262691.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/download_surah_al_waqiah_latin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/clinical_pharmacy_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/9960116693.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/83962633208.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45865267400.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9686/files/pajog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/baxogeluzuwudalorumisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/doruxoluwizuwemajujoxotox.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/79812366070.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008177.bin
7cf94b02550b13b82b38a19f313b168df29b377b7832f8f54739cc4ecb7330fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 5416 bytes
font_01_sfnt_off000093e3.bin
e6b8413f1eb3fb6d601cc9316763008e0a98a3b712a5d30573bf01341f4d69dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E3 10340 bytes

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