Malicious PDF — malware analysis report

Static analysis result for SHA-256 118ec7281570e0cc…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 05:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542939e718f273371b0ecb0f76827194 SHA-1: cde30878303aafa6049cb140bee5c42ecd6c22c3 SHA-256: 118ec7281570e0cc372ab1f3788abd7eb77e0b24dbbc75a747ed6ef053143488
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body and embedded links suggest a lure for downloading a PDF, likely to distribute malware. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to a harmful destination.

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/pify?keyword=clinical+anatomy+by+systems+pdf+download
    • http://files.jenwahintuition.com/uploads/1/3/1/3/131381006/41a12ca2bfad29.pdf
    • http://files.msohomes.com/uploads/1/3/0/8/130874477/maxibikub.pdf
    • http://files.ziontbc.com/uploads/1/3/1/3/131380397/vuxamijezat_volifulisowogu_jemefonim.pdf
    • http://files.annagayatri.com/uploads/1/3/0/7/130776063/xaleme_pasajuzafev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/23100889270.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/merulukulekolikefipitatot.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/dijotekegewerom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/larox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/97222405334.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/getaranomuzojowinanamifaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/42811347961.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/55105082879.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_off00006c79.bin
b3135d937b1f0362be90923041f3a2eba87ec67029ea7be68fbb03030d3ee251
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 5444 bytes
font_01_sfnt_off00007f00.bin
6122204544b62095f47af9a15292c2d54432b218391da386084e6b8e9ad35289
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F00 10144 bytes