Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb6f5ad4ecca005…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 07:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a2145054c57822d29595caaa41955f SHA-1: bb43affb54365fe711eeed5ecbb3769632608263 SHA-256: dfb6f5ad4ecca00532646edd4e205dda217b5661ee7f9ed92f2753fd0809413a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The presence of numerous links, many pointing to Shopify domains with PDF slugs, suggests a link farm or SEO poisoning tactic to distribute 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.ru/pify?keyword=advantages+and+disadvantages+of+computer+technology+pdf
    • http://files.vermontphotos.net/uploads/1/3/0/8/130814382/1951850.pdf
    • http://fivobab.pathwaysretreat.org/uploads/1/3/1/4/131452958/6327212.pdf
    • http://files.ineslampreia.com/uploads/1/3/0/7/130740625/7c43f893fcf66c.pdf
    • http://files.cvsmusic.com/uploads/1/3/2/6/132681559/sewiwazis.pdf
    • http://www.fotolia.com''gt;Fotolia.com/a'gt
    • https://cdn.shopify.com/s/files/1/0436/1430/6467/files/blaise_cendrars.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1271/files/82540555169.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/15686205417.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/sizemiwusukurirajori.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/arm_assembly_language_programming_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/0802/2938/files/80486269678.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/ignou_ma_public_administration_disaster_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/curso_de_ingles_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1606/6971/files/electrochemical_supercapacitors_conway.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/problem_statement_in_research.pdf
    • http://www.fotolia.com
    • 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_off00006632.bin
7de755a657f117a84079bc6485542b6a581420ccb732367229ce8ad306ea055a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 5720 bytes
font_01_sfnt_off0000798e.bin
7caa48eaa861cd9e0c1b17600e025919bc5d77d6d0daf1671d24d356b74761b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 10012 bytes