Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b4cd187b5e482d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 03:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0899b1ad91781176f1ddb9b3ecff47c SHA-1: 2b808df6f48af7e9b3fcd27381e06cb48e846568 SHA-256: 61b4cd187b5e482d8c1f83861a333736f8388ab20b9f3a4eef2585c080e004e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and heuristics for containing a malicious redirector link and a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=the+african+experience+vincent+khapo', which is known to lead to malicious infrastructure. The document body contains garbled text but also repeats the malicious URL and several benign Shopify URLs.

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/wix?keyword=the+african+experience+vincent+khapo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/lamborghini_chalai_song_mp.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/topipulurepotunaruvumuxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/boogie_oogie_oogie_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/bidivogapajubom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/bemis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/3._5_sorcerer_spells.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/cariotipo_del_sindrome_de_klinefelter.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/76346921495.pdf
    • https://static.usrfiles.com/ugd/cf79db_a27a0a7a47db4500a4efe95d73638978.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d449b3996d6457399ee79d7ab0a118c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3507dff1976a4b68a9b45fcd62197185.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/49603217566.pdf
    • https://cdn.shopify.com/s/files/1/0462/5052/4823/files/pakigaxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/53499628366.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/95981999538.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_off00005ff1.bin
6a7ebcf8b025ae381c04ab6c8bc2aa51b07933006c9146ccae88cb59b9f57451
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF1 5032 bytes
font_01_sfnt_off00007115.bin
48a7629096941ccccf42c3ebbde28a88e4c0b8c07d355a99d75cf5f00b02bd02
pdf-font-stream PDF embedded font (sfnt) at offset 0x7115 10444 bytes