Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bca6eab53952e1e…

MALICIOUS

PDF

44.9 KB Created: 2020-08-24 19:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c9529571b4bbf7f181719a3fa85203 SHA-1: c0c57faf9359c924b24e26ce5ac0abd4a7a69a50 SHA-256: 7bca6eab53952e1ef1e55ac440d85e4e5bacef2050b78a3ca3ca9083441cf91f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm or SEO manipulation scheme, potentially leading to malicious content or further compromise. No scripts were extracted from this sample.

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=calendar+template+microsoft+excel+2010
    • http://files.theapostoliccommunion.org/uploads/1/3/1/3/131379296/3864083.pdf
    • http://tegus.soldwithjoe.com/uploads/1/3/0/8/130813528/favomajefuniwopi.pdf
    • http://files.curbysickmonedu.com/uploads/1/3/1/4/131438056/bidevenolal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/krishna_bhagwan_photo_image.pdf
    • https://cdn.shopify.com/s/files/1/0429/1480/7974/files/apache_poi_convert_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/geometric_sequence_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/viduwapejubujawerofapiwef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/autotune_free_ableton.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/isometric_drawing_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6000/2967/files/x32-_edit_app_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/15357527457.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/guvor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4286/files/n64_roms_download.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_off00007100.bin
b1d0cba17e21705c75e8e6a8df9ec9eae1d4b52ebd41dfa1cb474736b7e245a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7100 5600 bytes
font_01_sfnt_off000083f9.bin
424cb1999afb53812d0cf0f2184dd1f3cae3987fb228bb0dbb19465548603286
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F9 10236 bytes