Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba7b7dbe44884c…

MALICIOUS

PDF

50.4 KB Created: 2020-08-17 10:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e43a11f3db36f796fd53c4bf813026 SHA-1: 5c56beb8e0b89c50638a3ff7058ea6d7fb72ac31 SHA-256: 67ba7b7dbe44884ca1f3a0fc01fbc75ad959f32c9b970474f4dc189a4b1c5c2e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, likely to distribute malicious content or phish users.

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=blank+character+reference+sheet
    • http://bamojegub.solglimt.org/uploads/1/3/2/7/132740780/4179088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/cladogramas_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/tumesugefodakawuzamiwupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/bizawukepekikifilofujuga.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/18190758369.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/38650505078.pdf
    • https://cdn.shopify.com/s/files/1/0430/5141/7751/files/new_studio_background_hd_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/tipuxekopapifofulosaxow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/60103047753.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/pilokovarixawokasolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/tikabirekaremapivas.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_off000088c7.bin
20e0613ceadef6905a1b339dfce917ca0e2746e920742c406a8c82c0452dea68
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 5084 bytes
font_01_sfnt_off00009a08.bin
953138b880855ddb2556da1a3af99c592e3521a183d8c55d7a423e4455135467
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A08 10232 bytes