Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cde7a73cf87435…

MALICIOUS

PDF

82.9 KB Created: 2020-08-18 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ff3223a604244914dab75cdf896970c SHA-1: 075f53b3734b8f115429de4735ce7e7011715285 SHA-256: f5cde7a73cf874352487092ddc8772f40e11693101207a04a94c4db0cff40f96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a lure related to 'Financial reports uk companies' and embeds a link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a phishing lure leading to a malicious redirector.

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=financial+reports+uk+companies
    • http://jaliser.ninamelendez.com/uploads/1/3/1/6/131606027/f0df3a.pdf
    • http://files.charlestoncob.com/uploads/1/3/1/0/131070247/4620781.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/nijakenumexoguxag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6295/files/dj_terbaru_2019_senorita_x_zombie.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/aviones_de_combate_modernos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/bakugozoda.pdf
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/46176029096.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/calculus_ninth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/79049514698.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/kopotekafazona.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/48814930276.pdf
    • https://cdn.shopify.com/s/files/1/0444/1961/2839/files/journal_of_breastfeeding_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0432/2980/6759/files/online_video_to_audio_converter.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/88351392605.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_off0000ff45.bin
f03bb536cedf97df6e2925d69ee94f58ab43fe7ecb02d3238a645bc50813c91e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 5100 bytes
font_01_sfnt_off0001107d.bin
74c1ca0846543d3c8cfa229e494be03af63585153734ced38c4f1d12c5471e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 14928 bytes