Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13e9c181facaed9…

MALICIOUS

PDF

33.6 KB Created: 2020-08-31 04:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6164ac2c9366d7a7df2d5979fb727dc SHA-1: 8a914f5bdfb64bfc0b727fab467ac85fc9c825ff SHA-256: e13e9c181facaed94812405bd93017975fc9df0bd1da2a5a82dbeffaf0800028
152 Risk Score

Malware Insights

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

The PDF contains a link farm of 15 external PDF links, with the primary link directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking Shopify URLs, likely used to obscure the malicious intent. No scripts were extracted from this sample.

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/wix?keyword=reality+fighters+trophy+guide
    • https://cdn.shopify.com/s/files/1/0434/2710/2887/files/ruziwuzewodatap.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/riluvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/.pdf
    • https://cdn.shopify.com/s/files/1/0436/0886/6974/files/year_3_maths_curriculum_2018_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/sewedukipexor.pdf
    • https://static.usrfiles.com/ugd/b8c837_9757a9fd410f454e90d91bf7c36e36fc.pdf
    • https://static.usrfiles.com/ugd/6f9b04_a98f82315d894c4bbae668ba599e0ab7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a292157288c34cb6a8fde7ba316f5abb.pdf
    • https://static.usrfiles.com/ugd/e5412a_42ac7af3b7f544ce9e419c9707bb8bdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73b640a1b314033a10e4d1afbca21dc.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/bodhai_kodhai_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8173/6096/files/barashada_english_somali.pdf
    • https://static.usrfiles.com/ugd/b47706_92478e01be544e3f9b8911a1dea02afa.pdf
    • https://static.usrfiles.com/ugd/de65f7_27fe3fae8abf4f2ba94a24b214cdd681.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_5f24c991c8e247d5881e4e0e0f7eda0f.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_off00004689.bin
99e8baddf9f5003af303cedf28a0d8e44f9531bc11eb341c096beee60df58fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4689 5412 bytes
font_01_sfnt_off000058f5.bin
4b5d349ff403e412a5ce4dad771e7f65b23273db96af7e9b9aed32d0886b3da8
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F5 9632 bytes