Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759faf5bfe7ba29…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 14:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185156d89f0e44f0d8fe4a38324cffe8 SHA-1: a90109b35a90a8331cc97045288281edeb97ec5f SHA-256: 1759faf5bfe7ba2932920044d6d52fdc212772b4e6b92ce1902dc093dd9356e8
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. This suggests an attempt to leverage SEO or distribute further malicious content through a network of linked PDFs.

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=mapleroyals+bowmaster+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a5e70e157be746149adf42f7af666429.pdf
    • https://static.usrfiles.com/ugd/b8c837_95d3cb5d56764b24be6e54d0e39ab094.pdf
    • https://static.usrfiles.com/ugd/b8c837_847af44f1b3546cfb31964275fee38e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5125ee476fa04a64b86f3bae39f23347.pdf
    • https://static.usrfiles.com/ugd/b8c837_49723570578744938ae893b0c9c2b14f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/63085403954.pdf
    • https://cdn.shopify.com/s/files/1/0453/8872/6440/files/23159012874.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/vekelazovokil.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/xirituzedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/52300768612.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/rololinawutoruzomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/14255120636.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/db2_sql_drop_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/vertex_form_worksheet.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_off00007ed8.bin
dc084104f8f817795826033fc7992159898ffdac20c102503fed6fcca37e7bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED8 5616 bytes
font_01_sfnt_off000091ef.bin
aa90f907af185a6c2eccc65626ed375d6a492576f4a1414674f357381df81554
pdf-font-stream PDF embedded font (sfnt) at offset 0x91EF 10856 bytes