Malicious PDF — malware analysis report

Static analysis result for SHA-256 d954537a179c9fc2…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 12:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3538ddd7e3baa554f51e583ab6f661 SHA-1: 60c7a2eb52ca3082045942f7561c75697c6aef40 SHA-256: d954537a179c9fc2a8df1f7d289666aee06d4d7097c5a187d77c321a58181c4d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the PDF is designed to trick users into visiting malicious infrastructure by masquerading as a useful resource.

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/pify?keyword=bodybuilding+exercise+database+pdf
    • http://weveba.saintmarysconventchiswick.org/uploads/1/3/1/3/131380600/wizusavuvasolad.pdf
    • http://files.finleyeaston.com/uploads/1/3/1/4/131406202/4bf7d015f.pdf
    • http://files.seoulvibephangan.com/uploads/1/3/1/4/131453252/begejo-kupugumijo-pexorelifip.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/i_am_spock.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/mitama_battle_cats.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/approximation_questions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/xukelikevokuwewudido.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/27169372724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/62060866424.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/the_rodeo_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5389/files/lesco_spreader_settings.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/alleppey_tourist_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed6.bin
744623a073c7b4f278430651b2fad386d00d2588913cc1b35d2a5a7c1aae0000
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 5684 bytes
font_01_sfnt_off0000824a.bin
1d1cc3d74477f21105d95c5f5e1c8bdf5c3b59c38f6777dd777f60a4c7ff2c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x824A 9872 bytes