Malicious PDF — malware analysis report

Static analysis result for SHA-256 6673ca78ad5aad5f…

MALICIOUS

PDF

61.6 KB Created: 2020-07-27 06:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce75495e283e2bec56aad7b857a8f768 SHA-1: cf1c62f1b47a9d7c4e6c525b61b6d66635d4ec54 SHA-256: 6673ca78ad5aad5fdbcdec7a612b57fee2e9b998b30471b23c3d2ee56d0a2e2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests a malicious intent, possibly for SEO manipulation or to distribute further payloads.

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.com/pify?keyword=insuficiencia+renal+clasificacion+akin+pdf
    • http://files.miramarbarra.co.za/uploads/1/3/2/6/132681062/doviratojeju_ronenilom_tubanamewu.pdf
    • http://files.beautyisland.org/uploads/1/3/0/7/130775528/rapebozurupekobigal.pdf
    • http://files.jakzandhoney.com/uploads/1/3/0/8/130874055/5606774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/wavenuzumeruxago.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/23896446157.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/vuwokanujulegurisixujak.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/romegajipeturewurabip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/ropimasonoxegade.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/lapudumujeji.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/wigopazuvumego.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9516/files/36539097685.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/pomupevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2600/files/pilozal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/xojorebesujub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/nedozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/12439975590.pdf
    • https://cdn.shopify.com/s/files/1/0437/4619/7653/files/65775786006.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_off0000aadb.bin
6e51215fa70db51a02814d8c935f0298dd04ea0879a2daf8c4b46f3d0f504f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAADB 4952 bytes
font_01_sfnt_off0000bbaf.bin
87a37899112249ba9aaa0a43b69f658146d3e27b7617c01987720e03e10ddcd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 14544 bytes