Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c86f4dbed60d60…

MALICIOUS

PDF

44.6 KB Created: 2020-08-25 20:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1db982f08caafe32a065f5997f3e5292 SHA-1: 3668ff792f30ed5e47b4bbf655b4788bebf3af22 SHA-256: 65c86f4dbed60d60c8063df9254969baa85d32859ad229f476c02e9a2c08ffe6
154 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its extensive use of embedded URLs, forming a link farm. One of the primary URLs, 'https://ttraff.me/pify?keyword=grammatically+incorrect+sentences+wo', is flagged as a known malicious redirector. The document's structure and the high number of external links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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.me/pify?keyword=grammatically+incorrect+sentences+wo
    • http://files.sathiavanee-veeramoothoo.com/uploads/1/3/1/8/131871891/jidutemepupaz.pdf
    • http://files.shelbydeep.com/uploads/1/3/1/6/131636589/zaven.pdf
    • http://files.rainboascales.com/uploads/1/3/0/8/130874085/abca4d2c1a6b8.pdf
    • http://files.columbuscountydisasterresponse.org/uploads/1/3/0/7/130776619/1e57710ffa97b9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2590/6336/files/tatemipipipomirijelu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4578/8565/files/8489287750.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/bakuzukonakobes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/potumofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/dusozeru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/gafojoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/57505595236.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/texumuwotaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/geditezerixomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/64996453544.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/82474748305.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_off00007116.bin
c7f65e45f8cb424f40eab6c808df70aded0a90394aa63b4286fc6f511b878f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7116 5172 bytes
font_01_sfnt_off000082ae.bin
476e6e93fd630eba44238f6ffd83b87a69eb6b286315ab0ab4acbc23c35ccde2
pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 10088 bytes