Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4e7eac11cca95f…

MALICIOUS

PDF

38.5 KB Created: 2020-08-20 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 216fb0e752ea5761c4ac9d9cb88c3e17 SHA-1: cf1d862fe7b0d91363aa19bb75d7e913b7904250 SHA-256: bc4e7eac11cca95f65c62ed1633476f941e4555e5f9de2aedc05397865d93f86
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Anatomy of aorta pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=anatomy+of+aorta+pdf
    • http://files.marriage.as4u.us/uploads/1/3/1/3/131379296/poradaneluba.pdf
    • http://ruloto.samuelfamilylaw.co.uk/uploads/1/3/0/8/130814328/vokodero_josapa.pdf
    • http://files.awolclothing17.com/uploads/1/3/2/6/132696063/962545.pdf
    • http://dedilejo.stpaullevittown.org/uploads/1/3/2/3/132303354/juxekajebase_xejek_fimogijezum.pdf
    • http://lixufo.dehoniansocialjustice.org/uploads/1/3/1/1/131164250/sigijugekibipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/sugaxomifutubaributevusev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/muruvidafazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/lab_apparatus_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/30848290949.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/fuxataliw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/cambridge_igcse_maths_extended_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/jeloperosutalenimiraz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/81919159897.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/jorukazawofetaro.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_off00005bdc.bin
1e2ff4bb78e039456e1f6a22eb0e448de01a8dbcf64c8a1f540f4075df40b13c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDC 5068 bytes
font_01_sfnt_off00006d0a.bin
cebf8dd0b8751f8c69a617aa04fe2cb959815011872946eea371b50278f2649a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 9476 bytes