Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b8349b181dcee9…

MALICIOUS

PDF

63.3 KB Created: 2020-08-10 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e1f1d39845348c5ad4bc837fa4b203 SHA-1: 23fe020ddf1f4dee347f7bfb677a388a36d7c05c SHA-256: 75b8349b181dcee972ff126dace08bf994297d69b0b6f7a95320683cde508bdd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=adrenergic+drugs+notes+pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URL and link farm behavior are strong indicators of a malicious intent to redirect users to potentially harmful 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=adrenergic+drugs+notes+pdf
    • http://files.bortscincin.com/uploads/1/3/0/7/130739212/rijivubatum-wokofitekodarek-saberosi-disupokezisote.pdf
    • http://xibupepod.universalwellnessaz.com/uploads/1/3/1/0/131070420/kexik.pdf
    • http://files.elegancebrands.com/uploads/1/3/1/4/131407802/3399065.pdf
    • http://files.noelkawano.com/uploads/1/3/1/6/131606257/0193d8c7dbdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/rti_application_form_pdf_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0450/1346/7286/files/data_structure_and_algorithm_in_c_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/62053227657.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/suxerojadozabuxota.pdf
    • https://cdn.shopify.com/s/files/1/0431/4542/9160/files/99789235350.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/juvasuvilafimeti.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/jimi_hendrix_voodoo_child_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/descriptive_research_titles.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/24299462731.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/buddhist_teachings_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/crediblemeds_qt.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/tata_ace_technical_specifications.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_off0000bae9.bin
147a0f45e7379d50b0d00882d0999be73e5e63de1f8ecec59c3927010a13f037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 5068 bytes
font_01_sfnt_off0000cc3b.bin
eded03bf17e97e3727df5fee1d083bc5ad29fe57f5bf469baa4ef3cd300b7cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10528 bytes

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