Malicious PDF — malware analysis report

Static analysis result for SHA-256 702a58106b05473f…

MALICIOUS

PDF

51.2 KB Created: 2020-08-21 01:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6adeadb03e5ce48fc27c612809faa7 SHA-1: 265fb829520e872e9d7c0fce8bf36e2daab98961 SHA-256: 702a58106b05473fb3f73d8d855a61f932d3a8358bbdfb0b2cb71f7fb63c4434
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of external links, many pointing to Shopify domains, suggesting an SEO link farm. One prominent link redirects to a known malicious infrastructure at 'ttraff.ru', indicating a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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=libros+de+auditoria+forense+pdf+gratis
    • http://juver.drwilliammunro.com.au/uploads/1/3/1/8/131871864/xowidaluvobabisi.pdf
    • http://biridafe.downingtownswimacademy.com/uploads/1/3/0/9/130969054/8099579.pdf
    • http://files.andrewjohnsart.com/uploads/1/3/1/4/131438840/4113472.pdf
    • http://files.stlukenewton.com/uploads/1/3/0/8/130814298/danukowenerokiragelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/55452407952.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/active_and_passive_transport_in_cell_membrane.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/63680974883.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/ftb_rf_to_eu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/anthropometric_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/behavioral_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/47590496980.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/18895853324.pdf
    • https://cdn.shopify.com/s/files/1/0449/6615/0303/files/log_antilog_table_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/94188999982.pdf
    • https://cdn.shopify.com/s/files/1/0428/0067/7031/files/42099913115.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/52927452146.pdf
    • https://cdn.shopify.com/s/files/1/0439/3415/4907/files/cooling_tower_handbook.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_off00008665.bin
fa278da69641b611b25237a3aaea8172f8410a333c0561d45de2e01ff93af5d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8665 5260 bytes
font_01_sfnt_off0000984a.bin
eaf6c5a3d453f5bd658318680326c1d9d1ab5f7d8dd2653d8c19dc990b70c08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984A 11696 bytes

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