Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e085a3cc14c5c8d…

MALICIOUS

PDF

34.9 KB Created: 2020-08-02 15:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da74c2c71deef6d90ebeb1defd1bec91 SHA-1: 2fc8f5f775deb0f367d468bb855cd0bc4b93afb4 SHA-256: 8e085a3cc14c5c8d6712d6685a2a07d248ba50c228195561b5fccdeddfadcdb9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a redirector service, which is a common technique for distributing malware or phishing pages. The document body, though heavily obfuscated, contains text related to 'vmware licence key' and a URL that further supports this lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content.

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=vmware+licence+key
    • http://files.sharingeducationlearningforlife.org/uploads/1/3/0/9/130969656/9a3dbef.pdf
    • http://files.piperscafe.biz/uploads/1/3/0/7/130775242/ebd8b0c.pdf
    • http://files.global4xloan.com/uploads/1/3/2/6/132695477/napaviliwikuxibofupe.pdf
    • http://files.kindred-strategy.com/uploads/1/3/2/8/132815979/4175327.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/49403921688.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/jimusutomosupon.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/80793893357.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/28048034764.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/korozubifosuwanetapuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/spotfire_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/6881/6544/files/76272939246.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/75106670097.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/3537607939.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/74600685024.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004da0.bin
f213e3f301177b3f799d42dabe13f9489c5c03cfaa9bcbca7691a62dda18b3b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA0 4992 bytes
font_01_sfnt_off00005e9d.bin
cae0e3375cc3b0e6d4aa1b9e7c00f16fe0987bd63c4fd4688510d975b731a217
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9D 9552 bytes