Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef850faca3774a8…

MALICIOUS

PDF

53.0 KB Created: 2020-08-06 21:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd0e682bf8a1813aa64b0ebf10f197a SHA-1: 589ffbc3f27f93b0fb92b9bbf0793622830ce5f4 SHA-256: bef850faca3774a8bd003bb0810392ffd98d240180e9ab0ff2b3d09fd11b3b52
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to potentially malicious content, as indicated by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=ordinal+numbers+pdf+download, which is flagged as a malicious redirector. The presence of numerous other PDF links, many hosted on cdn.shopify.com, suggests a tactic to manipulate search engine results or distribute further malicious documents.

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=ordinal+numbers+pdf+download
    • http://files.weekendinquest.org/uploads/1/3/0/9/130969364/javokenagilovi-gurirarud-mizel.pdf
    • http://files.tool-hire-shops.co.uk/uploads/1/3/2/6/132681826/zisadewaju_kezesuduv.pdf
    • http://files.melissa-haskin.com/uploads/1/3/0/8/130814591/nonagesazuviso.pdf
    • http://files.wonderfulhippie.com/uploads/1/3/2/7/132740804/rujototunelup-nedugag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/31469321815.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/doreruni.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/18774277206.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/depth_first_search_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7770/files/ridowogabipaxobus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/zelusobumesurupeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/37137941946.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/19199954920.pdf
    • https://cdn.shopify.com/s/files/1/0432/0844/2020/files/verypdf_to_word_ocr_converter_serial_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/majolojotog.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/56274363653.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/16893313456.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_off00008c59.bin
7d62146fb1dcb67b898d27142333ac5e6715bad1292a2e12af339c068704bdd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 5448 bytes
font_01_sfnt_off00009ec9.bin
614754f047878ca31919d2e31ef33836a4346d22afdebeaa70c5b03873371294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC9 12504 bytes

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