Malicious PDF — malware analysis report

Static analysis result for SHA-256 9130333bb961c819…

MALICIOUS

PDF

54.3 KB Created: 2020-08-22 16:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a6d7c3f172fcb819fc643036fe85d1 SHA-1: 48861e535c62707aae3c3b384877c556eb5a26b0 SHA-256: 9130333bb961c819a893081fbabea5365fa51decac92bf818108ccd7e7ab0d46
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the URL for the malicious redirector. This suggests the PDF is designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.ru/pify?keyword=ambito+laboral+pdf
    • http://files.theyallaproject.com/uploads/1/3/1/4/131452872/mizitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4491/files/three_waves_of_feminism.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/zikojosolaluvugiteroripob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/gowugesobukuxuvojig.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/is_there_a_zip_code_00000.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/zafofunitupomebunaxezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/6322045777.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/65955880607.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/zosimigofolidiburu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0560/6049/files/arizona_attorney_general_office_forms.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/crocodile_rock_elton_john_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/william_tell_overture_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2063/1720/files/bsc_math_notes_calculus_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/5437/3793/files/42541472146.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/30654967398.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_off0000948f.bin
bbf5341b225e537c9825039465ccdde74463e5a0b45d3bc3cfb81210e3adb0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x948F 5140 bytes
font_01_sfnt_off0000a5e4.bin
ffaa8ceab4e0d2c72e46a6a705be56ded61ccd97cfec8b2391e3c5defc6d1534
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E4 11564 bytes