Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4c74d64b49a514…

MALICIOUS

PDF

50.0 KB Created: 2020-08-20 07:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cffb1da073b00884910b1d6f8b39b22 SHA-1: fb09d6ea5499291893fd2fcd847a63a97d446254 SHA-256: 8f4c74d64b49a5147a8a209cc1c129de400dba5ca445e8ca0015eabc5a68608c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=unzip+tar.+gz'. This indicates an attempt to direct the user to a malicious site. The document also contains a large number of embedded URLs, many pointing to Shopify, which is a common tactic for SEO link farms to disguise malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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=unzip+tar.+gz
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdf
    • http://files.sciencealiveanimals.com/uploads/1/3/0/7/130738799/tagelurat_sasusuxaroxux_titamulafibew_gonikaxopivepok.pdf
    • http://nolaf.eaglehotyoga.com/uploads/1/3/0/8/130874317/0e44e1.pdf
    • http://files.visionalliancehomes.com/uploads/1/3/0/8/130813714/1814a1.pdf
    • https://cdn.shopify.com/s/files/1/0452/1938/1399/files/capitalism_socialism_and_democracy_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/livro_atkins_quimica_geral.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/zuniladolunagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/vuwofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/begizolalirujiwak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/buku_bandung_tempo_dulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0469/8535/files/zudafubawarelirojib.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/how_was_your_weekend_best_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7351/files/zelda_ocarina_of_time_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/bukoranuxebus.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/69217308553.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_off000086ac.bin
94495ee28384246d5c02080cd0531afbc2fe7bdacd0620f30bec0e6da4ada752
pdf-font-stream PDF embedded font (sfnt) at offset 0x86AC 4852 bytes
font_01_sfnt_off00009743.bin
10920d2db10a9035082f3f906997d44a03626593ef9f4722104a75beff42ca3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9743 10732 bytes