Malicious PDF — malware analysis report

Static analysis result for SHA-256 6946c84582304315…

MALICIOUS

PDF

40.9 KB Created: 2020-08-17 02:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ee89e01ff8c6ac39a355285c08b4baa SHA-1: 6eb69f0890b39c51ea2fff3763957445845b86ea SHA-256: 6946c845823043157346ba72879e28e2a6961d47bd626d759a2f2111e9fb5c0a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the document's primary purpose is to lure the user to malicious content via the embedded link.

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=bhabani+bhattacharya+pdf
    • http://bosiwiten.hotrodtrailersales.com/uploads/1/3/0/9/130969744/zitulaj-warelax-biwafamofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77636621448.pdf
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/dicionrio_jurdico_da_academia_brasileira_de_letras_jurdicas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/conclusion_sentence_starters.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/36444921009.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/27260959187.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/nejajokidomijag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/makupefabesuku.pdf
    • https://cdn.shopify.com/s/files/1/0447/9896/7974/files/lefimotewar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/45129544556.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/adele_21_full_album.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/75690591713.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b9.bin
e18eff77044abbfe9fcb807f72c959ed2678eb0a8c8f8c5248090ab13cdadc5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 5324 bytes
font_01_sfnt_off000074c2.bin
c2fbddf922618ce0aa3b72b19eee95f14a7f8489e8f18d2422b68618523e8e0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C2 9932 bytes