Malicious PDF — malware analysis report

Static analysis result for SHA-256 9611c0e379e56248…

MALICIOUS

PDF

61.5 KB Created: 2020-10-27 17:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a2bb0e55d77e45ad3961df054996b6b1 SHA-1: dc90f88694a77da8365531cfdb758faab5b9ecb7 SHA-256: 9611c0e379e5624829ee20aa67ade345903e448584e5fb19629670a3a61a4fb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=simple+subject+and+predicate+finder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f8d0cff1fe54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5f905c7f63f77.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/0ef5d6f8-a959-47c2-8d63-14c6c5ef315d/69634301622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51d345a-2ef2-448b-8f63-1fd7974134db/51254928120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc0db8a-7b50-4a1f-b814-7c43085c9bfe/nalituganonazep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58db821-bff0-4261-8cb8-a8d895130c0f/66927616918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20fad286-492b-4e07-93ee-7182b9e1efe2/pisokibevoguduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7f6bc2-b5fe-4e99-b9fe-0b3044e166cb/90878811611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d01a26-9e8a-4602-b7e9-5d43b0690f64/rugasisetupakeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb7b4b4-d8b4-4d33-9493-498914100435/caracteristicas_de_plataformas_virtuales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f299fc1d-9d94-45f5-a43d-54aaacf94b39/nickelodeon_rugrats_guide_to_adulting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1410/3462/files/smart_shopping_cart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8181/7494/files/xikidulemozudewutoxuniko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4366/7616/files/nyu_employee_health_insurance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6862/7384/files/novebituf.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/29692760326.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/torokivomirogogidovulele.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/asking_for_directions_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/capital_intensive_and_labour_intensive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3841/1422/files/modern_tribology_handbook_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/46674951109.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_off00009066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 2984 bytes
SHA-256: ba9c8dd00146663c49c3ae3604670dfaf5b75114bbde8e18c96e3b363165220a
font_01_sfnt_off00009b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0F 5620 bytes
SHA-256: 9965259cebaeb6f2b251784bd559e590fa3b661cfe962c99d9f61c227712a933
font_02_sfnt_off0000ae06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 10972 bytes
SHA-256: cd7f2bbc62001c23adc098c8b420c68ffacfd26e00306650bec5ef48de5efe80
font_03_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1