Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f521d941ff335d0…

MALICIOUS

PDF

48.6 KB Created: 2020-08-29 19:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03555e9c6fb8b9768954b4bc82ec661b SHA-1: 7e016db9f6ce8f1d31f68c96f4f4041df8c893a1 SHA-256: 0f521d941ff335d017c97c1925190ca76905bbe47132bf1b02502a2f8bf3a7d9
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with 30 identified as part of a link farm for SEO purposes. One of these links, 'https://ttraff.ru/wix?keyword=bdo+imperial+fish+trader+locations', is flagged as pointing to known malicious redirector infrastructure. The presence of numerous links and the malicious redirector suggests an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution scheme.

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/wix?keyword=bdo+imperial+fish+trader+locations
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0469/0562/2688/files/surexedas.pdf
    • https://cdn.shopify.com/s/files/1/0438/3529/3856/files/sebedamutanagunonaronux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/atomic_structure_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/form_csf_1099r_is_used_to_report.pdf
    • https://cdn.shopify.com/s/files/1/0454/5983/2982/files/retojip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/78273262338.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/34032264352.pdf
    • https://cdn.shopify.com/s/files/1/0437/6716/9173/files/biology_chapter_11_introduction_to_genetics.pdf
    • https://static.usrfiles.com/ugd/90423f_516cffd725064a9eb1adf11105789011.pdf
    • https://static.usrfiles.com/ugd/b8c837_4afe074db90c414882ada8697861c3ba.pdf
    • https://static.usrfiles.com/ugd/26938b_051e178620384fd28a3623f75c8dd84d.pdf
    • https://static.usrfiles.com/ugd/3aca14_5398adc4fcda44fcab820928e856443d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a21f5c85e794d8d9114d9f97d24ec2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fe4806c12d940f59fa3b05f91102399.pdf
    • https://static.usrfiles.com/ugd/b8c837_28be5ce0730148648273f226cb8352df.pdf
    • https://static.usrfiles.com/ugd/b8c837_a182443aa60d49d9aceba2fbf9fcfffd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ec284379e554faf84c97e216abefd89.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_off000077d8.bin
602e0f4c2b8fe31ab94cd1e08da48b4293a187cdf1b56a17be42e468aadf76e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D8 5444 bytes
font_01_sfnt_off00008a34.bin
4ec54a94770bcb987325f94648396c7221f11cd451393813ac9fd44796bfa3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A34 13760 bytes

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