Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b1a149cf2ed08b…

MALICIOUS

PDF

43.5 KB Created: 2020-09-03 02:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86abe50fb9ddb14e1cddb69ad1e5b7a SHA-1: 919dc19fbb32cf7953c9f70a0993eff4a98e7f27 SHA-256: 12b1a149cf2ed08b32da0fb55e7ba686c0c56d27bfa9b50dd46afe69b313d908
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, disguised with a keyword related to comparing Excel sheets. It also features a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL is a key indicator of malicious intent.

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.link/wix?keyword=compare+difference+in+two+excel+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/bhagavad_gita_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/the_bluest_eye_audiobook_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2119/files/tiwebixela.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/apm_terminal_e_form_13.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/72907597255.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/86297761213.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/formel_ausgleichen_chemie.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/rubexemi.pdf
    • https://static.usrfiles.com/ugd/d954c5_0c32657b7ced467c95f6f72a2176d97c.pdf
    • https://static.usrfiles.com/ugd/b8c837_746157b471144a1fb978a10598d5059e.pdf
    • https://static.usrfiles.com/ugd/b77b08_e37b4255623c4c81908e04e8ea9e792c.pdf
    • https://static.usrfiles.com/ugd/9dda13_2601447852504563b8c99703bd5d1ea6.pdf
    • https://static.usrfiles.com/ugd/576447_c1ae1ae99ae04fd38a2c3803b455b9cc.pdf
    • https://static.usrfiles.com/ugd/e2c250_291983c75ff84c7bb46581c97e0ab518.pdf
    • https://static.usrfiles.com/ugd/f3cb45_64efdd81f3904001bbf77c936f26ef85.pdf
    • https://static.usrfiles.com/ugd/8c0e65_4cc7bb50e9284114b778511770c85d95.pdf
    • https://static.usrfiles.com/ugd/ba3095_3d6135af920349cf9cb42464a9fae6e0.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_off00006ae4.bin
8385ab9ab950939cd9b995be6faea99097306371dfa903134ea92e4182a35a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE4 5460 bytes
font_01_sfnt_off00007d59.bin
f9ca740225bcdcc9c546aaf02dd25315048ab39b1880a627b5ba56dd8285cac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D59 10364 bytes

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