Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b0e5adaf8fa457…

MALICIOUS

PDF

56.1 KB Created: 2020-07-31 22:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e502883d0f09502cf61894d8b2821af SHA-1: d2bcf859390282a54903b54969aa87f72204dff8 SHA-256: 18b0e5adaf8fa457942ff43b07ecc378e415c556bf110dc55a55d0913328ae52
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 at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims to malicious sites. No scripts were extracted, but the presence of numerous links suggests an attempt to lead users to phishing or malware download pages.

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=class+of+3000+backgrounds
    • http://files.abarthdrivingschool.co.uk/uploads/1/3/0/8/130814466/3395625.pdf
    • http://files.mi-sheffield.com/uploads/1/3/0/7/130776484/82eaee87bd634.pdf
    • http://files.digivationsxgens.org/uploads/1/3/1/0/131070604/jubopepukuzodeduzo.pdf
    • http://files.w4sight.com/uploads/1/3/1/3/131379622/7131092.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/movebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/bisoneso.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/11626253673.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/87848094455.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/rojenonok.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/noligerazul.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/15626260794.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/xevesiwarigalokug.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/93194843282.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/megesupugigukerir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b9e.bin
40b21f5652156f1d56e5bf2c8997bc40b48e8939a3a5798842cd1e4a429b777c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 5360 bytes
font_01_sfnt_off00009dd0.bin
3c1fb2b914f070d3ff920e8c15a6d57debc29d7ab1b63e9e60240748f1df266e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD0 12520 bytes
font_02_sfnt_off0000c5e3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 4324 bytes

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