Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71111ad401694a0…

MALICIOUS

PDF

48.4 KB Created: 2020-08-31 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c60215c47528a5cd5b3e7e90730404f SHA-1: fde245bd2846723c8a4307dc8f506557bff7587d SHA-256: d71111ad401694a0aa892086db9ce2cbfc6d1987ed8d77a5d46c3272a4580788
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, disguised as a free calendar template. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. The document body also contains the malicious URL and numerous other URLs pointing to PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, limiting the analysis of the exact payload delivery mechanism.

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=free+calendar+template+dec+2018
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48465164240.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/wosexuze.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0673/files/44389180893.pdf
    • https://cdn.shopify.com/s/files/1/0432/1021/1491/files/adobe_reader_chrome_plugin_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/carbene_and_nitrene.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0e49f6ad0a14d05a1beb18eea53b9f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9204ea580f5f44c6bc5d9c83bcc08aba.pdf
    • https://static.usrfiles.com/ugd/451461_7ab33d4a84dc445bb8f1f0c99d6a7dc5.pdf
    • https://static.usrfiles.com/ugd/ab059d_eabb810042844eb9ae8c3fc9582c1252.pdf
    • https://static.usrfiles.com/ugd/930050_e88c021b6f774619bd764d6d48086d92.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/saxakowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/23661472113.pdf
    • https://cdn.shopify.com/s/files/1/0460/3281/4239/files/jogobirapawurokabosakuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/xupevojajux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/norekolaguvebe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3038/7607/files/similar_polygons_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/porsche_cdr_30_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0985/1048/files/givujenuwekoxuwab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d9.bin
d6921b1fb5afec1d591d342ca53e3836a24a52077ce8d657740b036bdedb8e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 5516 bytes
font_01_sfnt_off00007a85.bin
d222c3397031c07676f8879c608995054c9b39650d6d73c74195b93838a62367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A85 10932 bytes
font_02_sfnt_off00009fb1.bin
97e80cc61ebbc6fe4ed03ffd5a5ae1d184ef07adb4204580ef84f3eb02720edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB1 16108 bytes

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