Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e17c1b645882a4…

MALICIOUS

PDF

78.8 KB Created: 2020-08-03 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7071b3e78c9f97a4cc6684ce1a3e9c9e SHA-1: e5a4562a5fedfde55a77cebcb142bad71b93ebb2 SHA-256: 72e17c1b645882a4079aa3fa0d1a8af248cdbdd648d2e2a778b83980952d0ab8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF redirector link to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings, suggesting an attempt to redirect users to potentially harmful content.

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.cc/pify?keyword=inverse+2x2+matrix
    • http://files.brandtechnology.com/uploads/1/3/1/8/131856027/1587895.pdf
    • http://files.downstageimages.com/uploads/1/3/1/4/131407080/fc3bbfe79b.pdf
    • http://files.heistawards.com/uploads/1/3/1/4/131437045/dinuvi_dafafi_pigokazabo_lugaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8187/5112/files/62152017580.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/60671005873.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/nokevobumukezozituxov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/xajifogiliwojeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9646/files/fitune.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/76166960158.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/git_remote_prune.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/vukadirejidise.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/89682306442.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/86692156751.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/disadvantages_of_small_sample_size.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/92338467085.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b9.bin
7434cdb72c158c65cd6000cfd2f1ced4417a68b7f5eef9440e4869a919747d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 4996 bytes
font_01_sfnt_off0000e6a5.bin
c033b60888790305f028cec8c03fb285bb9d1954d87ab1d5a79f44bad32d7f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 15892 bytes
font_02_sfnt_off00011843.bin
f068e30824f6d79c3e51327af18f76b70899715e4bd83fe418f4350cae34ac73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 16364 bytes

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