Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f94de7e79f48a1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-12 10:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9853a7bb6abe4328b874feb72de8c79e SHA-1: 5341de07b1605d68ff313710722e6bba5b1f969f SHA-256: 10f94de7e79f48a1fa6cb76b62300ff4062ab037521a63bc2d65ed3d016778b9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the link farm heuristic indicates a strong intent to direct users to external resources.

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.cc/pify?keyword=the+biographical+dictionary+of+film+pdf
    • http://mexiv.mcgraththerapy.com/uploads/1/3/1/3/131384709/1013961.pdf
    • http://files.insulators41.com/uploads/1/3/0/7/130740166/747528d.pdf
    • http://files.stonemountain-capital.net/uploads/1/3/1/3/131383943/sebixixuvukef.pdf
    • http://xagedo.acorridor.com.au/uploads/1/3/0/8/130874493/0aa96.pdf
    • http://files.amyplanttherapy.com/uploads/1/3/1/4/131438389/d557215df6d53a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/18802884759.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/mac_restart_ssh.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/abbyy_transformer_12_serial_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/55693898732.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/83931184961.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7520/files/90172499426.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/welevizanasenunadegufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/coolmathgames_console_hacks.pdf
    • https://cdn.shopify.com/s/files/1/0432/8695/4139/files/68276873842.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/ramulakuxoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2337/files/bavojatafivomawuvunej.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_off000063eb.bin
7f59321c26bfb33df93dd3cbf9b5526a00ac1aaec7edd6f26269873818e6fbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 5584 bytes
font_01_sfnt_off000076bd.bin
61a685e1211ba6ffa8a85c3c30a2e2d5d5e71d744534e36888c10ee1dfc8a957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BD 10200 bytes

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