Malicious PDF — malware analysis report

Static analysis result for SHA-256 70564d66e6095d3c…

MALICIOUS

PDF

37.7 KB Created: 2020-08-24 22:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9d083b19428195e5da08f409348ecb SHA-1: 51fe25e9d1fd986b82544a5d0493b054e5497be3 SHA-256: 70564d66e6095d3c4db65f2c14ced73ae3a849fc985141a8a1ffc42bfc0fbe70
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=gta+lcs+cheat+codes+android
    • http://files.tipsyglasswinery.com/uploads/1/3/2/6/132683154/ca53cb6e9db4.pdf
    • http://files.stonesj.org/uploads/1/3/1/4/131438265/7835114.pdf
    • http://vewojuvo.backpackconnections.com/uploads/1/3/0/9/130969634/sinaluwazomizuse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/system_mechanic_pro_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/samsung_vrf_catalogue_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/5603295145.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/71982398298.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/case_study_structure.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/autocad_2013_full.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/amharic_to_tigrigna_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/80973950155.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/sifavobewimudinefitebuleg.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/budget_adoption_fact_sheet_2017.pdf
    • https://cdn.shopify.com/s/files/1/0439/3625/2072/files/acidosis_metabolica_en_recien_nacidos.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_off0000552a.bin
7e6e9b8f49db626fabbe3309214ac04ac63c32ae389d9bc08f3db6edf8c89614
pdf-font-stream PDF embedded font (sfnt) at offset 0x552A 5056 bytes
font_01_sfnt_off00006647.bin
d6c64c9c27f6eff8139dd27991af9ed2512c3506cc95a53504352151e1b1b0e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6647 10652 bytes