Malicious PDF — malware analysis report

Static analysis result for SHA-256 104fb02ac301ef36…

MALICIOUS

PDF

48.6 KB Created: 2020-08-23 16:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30edb53334b1ec1acb3e42e4c46f14a3 SHA-1: 7cf5b6edb0f4dbf1bea98b4fed2c3ea9ecb7a121 SHA-256: 104fb02ac301ef36efcf900a39b46473db1ec6b8893f5b3bb598411b45eaa4da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of 11 external PDF files, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and text related to the RACI model, suggesting a lure to external content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=raci%2528+responsible+accountable+consulted+and+informed+model
    • http://katim.spanishkc.com/uploads/1/3/0/8/130874588/2584736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/accounts_receivable_specialist_cover_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/almighty_bruce_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/deep_learning_book_ian_goodfellow.pdf
    • https://cdn.shopify.com/s/files/1/0430/9922/6265/files/31943523501.pdf
    • https://cdn.shopify.com/s/files/1/0438/9126/1595/files/7415673284.pdf
    • https://cdn.shopify.com/s/files/1/0435/0925/2250/files/solid_waste_disposal_methods.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/liwudefajarazazel.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/general_reading_practice_test_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/giminelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/vavinajonefuza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007052.bin
61f83e05f87e5de70892c261e60f7d1d97d381284b8a5cd8b722cd04a38d43cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7052 5408 bytes
font_01_sfnt_off0000829d.bin
ec10d83bfb5e66d438a737b27d4044dd41ff52999435e73f189604570f2a3743
pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 10176 bytes
font_02_sfnt_off0000a54b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA54B 4324 bytes