Malicious PDF — malware analysis report

Static analysis result for SHA-256 4323a1b1f4a8e6e0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-09 19:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8ea652c58c6aad4937afdcc54ce5e3 SHA-1: ace8d3a3c2abaf80a8bd2f6d71b0a0b9de65267d SHA-256: 4323a1b1f4a8e6e0d504458cfb379b106f2a498255b08939fbb68ada3bff917c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a known malicious domain, disguised as a medical certificate download. The ML classifier strongly indicated maliciousness. The document body and embedded URLs confirm the lure to click on the malicious link, which is designed to lead users to a harmful site.

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=medical+certificate+pdf+download
    • http://files.olypeaks.com/uploads/1/3/1/4/131407194/949849.pdf
    • http://files.victoriazamora.net/uploads/1/3/0/8/130874252/tasofopapofa.pdf
    • http://metulev.providencebaptistchurch.org.uk/uploads/1/3/2/7/132740405/siranuwuw.pdf
    • http://files.mrsdawson-classroom.com/uploads/1/3/1/3/131380213/82ad8784c19aade.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/valez.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0610/files/bible_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/paluligebirasafuvakirito.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/def_jam_fight_for_ny_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/netugon.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/75861499479.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/bimakemosolufagonafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/97364787481.pdf
    • https://cdn.shopify.com/s/files/1/0440/7571/2664/files/mancosa_assignment_cover_page.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/d_d_5e_dwarf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/definition_of_social_media.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/49596494860.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/alkyl_halide_mcq.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_off000065ec.bin
d48d8c951516cf3a34c6196c65eb749a6e6b2f081f056530877a178140fdebe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EC 5068 bytes
font_01_sfnt_off00007757.bin
5ebb6aa4c971bd54282a76ec955afa6744f43a0377f158f2e8fd311c9829afdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7757 10996 bytes