Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c780bc76601554…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 11:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219ec3fef2d7a4593f2a580e7eb4ca72 SHA-1: daa285f0607ba956b883feb91b03a2f4591b5447 SHA-256: 88c780bc766015544407cea51aa54c386274f5d1680c60d11020c2146828e3ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a title and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious sites via embedded links.

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/wix?keyword=reprisal+imdb+parents+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/42377214612.pdf
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/40496061858.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0575/files/mesema.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/27175304062.pdf
    • https://cdn.shopify.com/s/files/1/0431/3514/0007/files/2858536343.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c6f48aa114e01934e7c0366e1c7f3.pdf
    • https://static.usrfiles.com/ugd/ae059d_4771276090df46c9bbb89efb94eeef19.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a144960a525420684dbeacbb8ec8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_32fe25f75ec94347bb927212096f365a.pdf
    • https://static.usrfiles.com/ugd/9e53d4_414e03538e014664963e33e70b4149c0.pdf
    • https://static.usrfiles.com/ugd/d54300_8f64d05b11e14ac9bf58b45dd52f82f3.pdf
    • https://static.usrfiles.com/ugd/724bd4_3fc0f804eb2d4f1e9952502093b3408b.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/merge_free_online_tool.pdf
    • https://cdn.shopify.com/s/files/1/0452/8416/3746/files/basel_norms_1.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_off000069b0.bin
7506e1077e2d6f5e7d83a4301d3baff1b4959001ec5ba9272c25b247a9085950
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B0 5424 bytes
font_01_sfnt_off00007c04.bin
61fbe5f0185e928dcc539d7f08e5336f12bbacb49e3b1e227b3b267a72213621
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C04 10996 bytes