Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec02aef1c7bcea0…

MALICIOUS

PDF

51.5 KB Created: 2020-07-28 22:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a172752219e55a38f184d5fadaf61392 SHA-1: a510bfe302b96873ebe681d01757910fbdd845f9 SHA-256: 0ec02aef1c7bcea0cc8bcd34963b1df5e0a48358aec3f7523e60137eae830af4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, a technique often used for SEO link farms to manipulate search engine rankings. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The document body, though heavily obfuscated, suggests a lure related to 'wedding invitation card website template'.

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.ru/pify?keyword=wedding+invitation+card+website+template
    • http://files.kia-ora-switzerland.com/uploads/1/3/0/7/130775506/cbe8b3c156057e.pdf
    • http://files.charlotteareabridalshows.com/uploads/1/3/1/6/131636562/1183932.pdf
    • http://files.calicoband.com/uploads/1/3/0/7/130776462/7735872.pdf
    • http://files.stgeorgestbishoyvisalia.com/uploads/1/3/1/4/131437750/438653.pdf
    • http://files.mrusselldesign.com/uploads/1/3/0/7/130739144/8228635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/2125499304.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/rikugolukilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/27633077104.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7055/files/39902528371.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/piner.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/zobibetux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/kebijivexaxijajigip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/12376845707.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/fefidut.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/putebufuvofubu.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_off00008b66.bin
6070412685ed3957d1dad20390c214c1f65b008913593938fc32699cdf56eef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B66 5488 bytes
font_01_sfnt_off00009e04.bin
cb27244036db611e172e511d3eba2e21b8a6f9a65fae37fea2c9be67eae83443
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E04 10000 bytes