Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf0fa7683a59af…

MALICIOUS

PDF

47.2 KB Created: 2020-08-21 19:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2eb0881de04628e9bddc2f0cd7b495 SHA-1: 3f03081d54b8f982657c8a51f2c88a9df0f30acb SHA-256: 83bf0fa7683a59af4bb555044ae83282290dbe95b50935455700e1b7d7fc2014
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of the malicious URL is sufficient to infer a phishing or malware distribution attempt.

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=european+guidelines+hernia+repair
    • http://files.clevelandpianoteachers.org/uploads/1/3/0/7/130775145/b222848.pdf
    • http://munoretu.projectlodo.com/uploads/1/3/1/4/131453041/wurumonafozosafowor.pdf
    • http://files.mrycpetcare.com/uploads/1/3/2/7/132740498/gobizorijuvusekaj.pdf
    • https://cdn.shopify.com/s/files/1/0465/1607/6694/files/atmel_studio_6._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0301/7373/files/accentual_function_of_intonation.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/basic_electrical_engineering_important_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/rudelodubixorubolarifuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/robin_hobb_book_order.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6064/files/ledanuvukemelovotikow.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/xibudabexotafuzup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/alumnae_plural_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/23644747016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/wupidirogagaxevuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/30485138711.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/science_direct.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af3.bin
77fabbd6606329c090bdf3f11cf05235850737c7e2dc68330bb3a4768b530106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 5180 bytes
font_01_sfnt_off00008c84.bin
b90fee98b4054d1ed562abb30e54b085f799521947edf0e7049641d4adfd51d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C84 10268 bytes

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