Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f9420eb9f9c01…

MALICIOUS

PDF

39.5 KB Created: 2020-07-31 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26aa8413559c6b24a5b2803ff011e7a SHA-1: 908260a42b15cf60133df04ae83c0bd19401f900 SHA-256: 663f9420eb9f9c01f029a2d671f8f9ecaa9c195de82515b8e8e5aa3301dd0529
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 ML classifier also strongly indicated maliciousness. The document body and metadata suggest it was generated by wkhtmltopdf, a tool often abused to create spam or phishing documents.

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=been+vs+gone+exercises+pdf
    • http://files.prettybauble.com/uploads/1/3/0/7/130738993/lusup_dawez_sowubobodo_zonulaxoduniti.pdf
    • http://files.firstnewark.com/uploads/1/3/1/4/131455832/50539952ae7.pdf
    • http://files.waverleyplastics.com/uploads/1/3/0/7/130738722/famiduw-pinowebibot-bowixa-gamas.pdf
    • http://files.nykpart.com/uploads/1/3/0/7/130738534/jebafelom_resazoluzej_wobadadifewek_dejomilarafag.pdf
    • http://files.congregationbethshalom.net/uploads/1/3/1/4/131437984/1897289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/diberamirikoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/jedikafozotit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/25610218349.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/36578026551.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/wulej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41877136991.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/1063811407.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/12977947857.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rajijabobuzev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/runigisasiwod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/gosejinata.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/pelil.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/86066525504.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/45785803956.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_off00005c88.bin
9083b8215ff120ff17830a4526f540235b6861c55a9e13ba2e3e9a94431c1445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C88 4968 bytes
font_01_sfnt_off00006d7b.bin
3d56dd9bd49eee7f75967fd65c5b103bd297ac1533e9f32cde7cec0458e24e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 10392 bytes

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