Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b81a9cfcfa9fbd4…

MALICIOUS

PDF

45.0 KB Created: 2020-08-07 15:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f039eb470f622c0b45e4926173f550b SHA-1: 7ce49260acffd93a7a1f2342d02a341aa6e205cd SHA-256: 5b81a9cfcfa9fbd4d907fc10e090306d4aad02f803a3bb76b66bf1a73d3d4384
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with a heuristic identifying it as a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=fonctionnement+de+l+appareil+g%25C3%25A9nital+f%25C3%25A9minin+pdf, is flagged as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious URL and several benign-looking Shopify URLs, suggesting an attempt to disguise malicious activity within a large number of links.

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=fonctionnement+de+l+appareil+g%25C3%25A9nital+f%25C3%25A9minin+pdf
    • http://vezer.naileditdoc.com/uploads/1/3/2/8/132815002/fasazanarogu.pdf
    • http://files.anyball.info/uploads/1/3/2/7/132710759/0362793e98800.pdf
    • http://files.danesinaustralia.com/uploads/1/3/1/3/131379730/bb9c86f2d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9111/5678/files/hectares_to_acres_table.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/69112879463.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/98030648765.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/54642930413.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/radar_anti_jamming_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/nfpa_58_2014_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/95787186091.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/73811168632.pdf
    • https://cdn.shopify.com/s/files/1/0431/2544/0669/files/29218777247.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/55743014109.pdf
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/kawesozifipamodididuxot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/income_and_substitution_effect.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_off00006be3.bin
332c63403511d813986213ed8f5cf7931a3b8e0446e0fc7174d859143bf2d801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE3 5396 bytes
font_01_sfnt_off00007de8.bin
6b834ff129c1ab1dbff8e6b73004cc5c35df3b1b7308ecbe9d1b591d32dac6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE8 12376 bytes

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