Malicious PDF — malware analysis report

Static analysis result for SHA-256 7870ccdb140c77ba…

MALICIOUS

PDF

50.9 KB Created: 2020-11-05 20:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d7259e2c3d871db16d56b2ed733f4577 SHA-1: c6bbcb56c2bfdbc8548a4ea908845bfe964b04d7 SHA-256: 7870ccdb140c77ba9906408423c1c5512c704129abfde1b40c10f1ae39694d72
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. This indicates a link farm or SEO manipulation tactic, likely intended to distribute malware or lead users to phishing sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?keyword=como+te+extrano+mi+amor+lyrics+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fa20a0e8b77d.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/6390004.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/e4af33a3a.pdfIn PDF document text
    • https://novafexoxola.weebly.com/uploads/1/3/4/4/134400343/laberapupipazin.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/tuzodijiviwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8e2291ef13a.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/6d4b79f39c6578e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6dc1f8-e5f6-48f2-b859-5c6e19417ab7/sudovonekexip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d912a93-9428-43b6-92b1-d2638734dc0c/motajabemegilovivetozu.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/embryogenesis_in_mammals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b2d087-82cf-4115-814a-23948c90d6a8/69657662897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8446/2274/files/making_learning_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/nimefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4961/9103/files/gugeno.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2A 5288 bytes
SHA-256: 7b06d677991cf9713594dee495b6a5e768dbb7306de5f1c93f3af9e254a86058
font_01_sfnt_off00007cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF9 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00008586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 10284 bytes
SHA-256: 2dd65f58464881d3a47c1abe5aa560b8e12b73919704d90beea4169925f66eb2
font_03_sfnt_off0000a8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F9 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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