Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18b61924045bac6…

MALICIOUS

PDF

41.8 KB Created: 2020-11-03 10:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48fca4b22460442a744c397067c5507f SHA-1: 781496dce76d7ba9904b15bf846d6828fb7fdb6d SHA-256: a18b61924045bac6ab549edd142eecf22b9b655eadaf6991974121d8cb3be107
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources and are likely part of a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/aws?keyword=keepvid+apk+crack
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/mebilufi.pdf
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5f9cb6cbec503.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/jugepuzor-foxugulewozovem-fogewelaninepi-lababusil.pdf
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/vimalozugo.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/29e2ac3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/manvasanai_tamil_serial_episode_1.pdf
    • https://s3.amazonaws.com/vikukinumet/aiche_national_meeting_2020.pdf
    • https://cdn.shopify.com/s/files/1/0495/7519/8876/files/kagubuli.pdf
    • https://s3.amazonaws.com/jimugivos/btd5_hacked_download.pdf
    • https://cdn.shopify.com/s/files/1/0504/4083/1155/files/73255765751.pdf
    • https://s3.amazonaws.com/gosete/vosemazafuponumiwomix.pdf
    • https://s3.amazonaws.com/gebaxovudofe/ranugumafusuvitorazobun.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9374/files/mosirevuso.pdf
    • https://s3.amazonaws.com/jivuxo/blended_learning_models.pdf
    • https://uploads.strikinglycdn.com/files/04c27508-e899-4974-91f8-8f4ac1605f80/20683337081.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_off00006670.bin
f2a9be14d8ff476fdc7433de6be7231ae8ff02accca080564ade571938010a90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 4948 bytes
font_01_sfnt_off00007760.bin
c50f3939271972d3796c47e91789a83b94e7c72034886fef48d0aea6062ce01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7760 10464 bytes