Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fb4f8570debe84…

MALICIOUS

PDF

51.9 KB Created: 2020-07-27 08:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f969bbe34fda38c6b10153d23f1522 SHA-1: 0809ba9df7262f071d7720dcc0eb71adfbeb76c8 SHA-256: 61fb4f8570debe84b5f87f9ba030f63476c9d226ab2094059b27ddf2d262b5d2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure and embedded links suggest an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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=aulas+de+ingles+avan%25C3%25A7ado+pdf
    • http://files.erinboake.com/uploads/1/3/0/7/130776718/maxul_zefanenumu_ruxuxotevar_jazomagudigem.pdf
    • http://files.kristinvanrisseghem.com/uploads/1/3/0/7/130776607/gatog.pdf
    • http://files.nycsigmakappa.com/uploads/1/3/1/4/131453499/fb96883ee0.pdf
    • http://files.plumbcogroup.com/uploads/1/3/1/4/131453539/wabavazunipozok-befuwasazejud-gurisiruxenob.pdf
    • http://files.realfauxfinishes.com/uploads/1/3/0/8/130874154/52aadde1f45e44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/jumivotitos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/5861803483.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/fefibarotinowi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/88886403984.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/suzeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/1720020679.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/makavoxelasolavuwukeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/17020277258.pdf
    • https://cdn.shopify.com/s/files/1/0435/3422/1466/files/xesesigugefupomi.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_off0000883b.bin
42e72302374be4621d81e2fe87eecf7e6c3508b056bb7d4bf5ceb51dd5d3bf04
pdf-font-stream PDF embedded font (sfnt) at offset 0x883B 5144 bytes
font_01_sfnt_off000099c9.bin
8b22705ecc06acac6c3e5609efe22f8e07c7b9bdde1831dc8f8d5645820425d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x99C9 12924 bytes