Malicious PDF — malware analysis report

Static analysis result for SHA-256 14723b9eba85d642…

MALICIOUS

PDF

52.3 KB Created: 2020-08-08 01:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e506cb855bf898e795eb843b575dd6c8 SHA-1: 1ff11f00951ab8076833682cd5294cf1af35a712 SHA-256: 14723b9eba85d642c8a24693dde39cca8ed5b2fe000b952bfe237a45eddc0492
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 a redirector service designed to lead users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms the intent to direct users to potentially harmful sites. No scripts were extracted, but the primary attack vector appears to be a link farm designed for malicious redirection.

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=barbara+cartland+pdf+free
    • http://files.inhcc.net/uploads/1/3/0/8/130813413/242392.pdf
    • http://files.lonemami.com/uploads/1/3/1/1/131164097/30410226.pdf
    • http://nijuvi.aspergerdrivertraining.com/uploads/1/3/1/6/131607062/9908083.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/sor_callista_roy_biografia.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/jovewunamelulami.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/67839550721.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/85343680175.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/43166666337.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/damewumasilagu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/39494293944.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/7350615236.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/95841605765.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/futaguxijerutoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/33941040372.pdf
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/tinovetefukasi.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_off0000838c.bin
05f6f0dfcc7eaf3fd07b85890ac9038bfe1eae90b530991bf2acc7cd5fdc4b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838C 4792 bytes
font_01_sfnt_off000093dc.bin
a52a78ce4214a65b9374b0ddc2eb6654035a4a8806c88ca6f9df84c947a42b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DC 10024 bytes
font_02_sfnt_off0000b631.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB631 4324 bytes

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