Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c840b155a7a0ff…

MALICIOUS

PDF

41.9 KB Created: 2020-10-14 17:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c7d0d90e8fe08e7771ac205d5e790cb SHA-1: 6851b87603ddee82a970a785bfc6b82187640bfe SHA-256: 27c840b155a7a0fff17568b7e3802917b8b4dfe53118000b5d009de8d0ffcc71
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector service that is known to host malicious content. The document body also contains a direct link to this malicious redirector, disguised as a software download. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute malware or phish users.

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://cctraff.ru/pify?keyword=wavepad+sound+editor+mod+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8702849917b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f86fc0258a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87007f2117c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f870c3c5237e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8708e626212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f8708bf21510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f870c17e0c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f86fea543283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f9ae6d733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f87072455f7d.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/mikude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0886/0575/files/towelroot_apk_download_for_lollipop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/6444/3299/files/friv_3_unblocked_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3540/1633/files/volanomewamerilodosapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2255/6058/files/woxebemapunavezopijevuxad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6068/6748/files/vodelup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/how_to_hack_online_games_using_apk_editor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6657 5212 bytes
SHA-256: 2f37bcd065eec8e10c775e7a71a70f0eb32d4c3896ccb9be021573168d7da5ce
font_01_sfnt_off00007801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 10096 bytes
SHA-256: 246d62026dff659ec27053a824e2ab92f9320752ac7330cd2ea8a0b3bd437bc3

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