Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59b91a3e1ddbf8c…

MALICIOUS

PDF

50.0 KB Created: 2020-10-17 04:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 764a7719d38ca526dcc6a370d1b2170b SHA-1: 3f920685fba10cc6cc95d905dd4e77fe94256870 SHA-256: a59b91a3e1ddbf8c28d18cb09324014d4150a28baec1c73c866b819695965c66
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 PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the search query, reinforcing the lure.

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.me/123?keyword=geometria+y+trigonometria+baldor+3+edicion+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f8932116b81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f88d78c4bc2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f89ff6b3ce32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f87041e7bac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8887aaf0f93.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/tatokitone-tolozigaxijigep-norikesuk-karikiba.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/927483.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/the_linguistic_nature_of_childrens_scientific_reasoning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1743/9902/files/foot_in_poetry_meter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4500/2657/files/3_types_of_matter_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/nubawigujakojubinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/gikizud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6495/8369/files/fuwijozawozuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0436/1366/files/hamilton_intra_matic_chrono_blue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/wofimolunivesunoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3880/9498/files/giwanivilunenemeliteti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9140/2146/files/comptia_cloud_study_guide.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_off00005ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 5524 bytes
SHA-256: d3e32aea6eea70b869e5a7d2ed878826a6027b4ea9c4b128abe3e00fd301adbc
font_01_sfnt_off0000715f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 10492 bytes
SHA-256: 0b226d572b435433413021942f8376b79d323cc2842154d081eb740e975a7929
font_02_sfnt_off0000955c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x955C 16096 bytes
SHA-256: 301fb2f14aa1e9a5cf8540ebf40f17e8311eb9ba756e1d76589e408feb703965
font_03_sfnt_off0000aa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA22 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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