Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e1d28bef3f72a…

MALICIOUS

PDF

53.6 KB Created: 2020-08-07 05:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f014f91e2581add58e9b8148a6805c2 SHA-1: bf55260ab4bd47e080ca226988785e858a079231 SHA-256: 3b4e1d28bef3f72a791e0003d29fc88c5f2f7f1dd00ed1fba0ab98bd580e2b91
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=flamenco+guitar+for+beginners+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on cdn.shopify.com. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same lure text as the malicious URL.

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=flamenco+guitar+for+beginners+pdf
    • http://kupolige.viewsonbrews.com/uploads/1/3/2/6/132682076/lexugedozotez.pdf
    • http://files.choteautlc.com/uploads/1/3/1/4/131437766/9731777.pdf
    • http://files.yvcjoplin.org/uploads/1/3/0/8/130813934/74b43108.pdf
    • http://files.scotthillmanstudios.com/uploads/1/3/2/3/132302960/sefovuworaguri_buzovore_vikamasasiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/baluzuzariwekimenoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/xoxepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/boolean_algebra_and_combinational_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/1061079820.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/30417972069.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/best_free_reader_for_ipad_mini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/84357299236.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/pagiwunit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/bulk_density_chart.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/astral_projection_free_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_off000093c3.bin
e4bbc088796eb5b5ca0e787b4a8bdc52c70409876d438d9fa8c333fb22db9422
pdf-font-stream PDF embedded font (sfnt) at offset 0x93C3 5568 bytes
font_01_sfnt_off0000a69c.bin
a9291be146217fbd28ef2e0f3c29712afd68d10bc7f25e6e4810cc43353d38ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xA69C 10140 bytes