Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da5caf7f490f6c8…

MALICIOUS

PDF

62.3 KB Created: 2020-08-24 16:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c0f5c6e40c382934ad178a0f41d08db2 SHA-1: ff17959a3d3c4c9d72f4034634e9988906abbdb0 SHA-256: 0da5caf7f490f6c8f26ad175fc9b210cfe1aba080a22216ce8afc462155fadbc
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://ttraff.com/pify?keyword=biology+notes+form+5+chapter+1 In PDF document text
    • http://kinekag.petenicholsonhealing.com/uploads/1/3/1/8/131871864/acea79.pdfIn PDF document text
    • http://files.steelbridgecoffee.com/uploads/1/3/0/9/130969987/ca73af2ee.pdfIn PDF document text
    • http://files.quietlegend.com/uploads/1/3/1/3/131380343/tususebanogosa-vobasofedas.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/1/0454/4213/8262/files/instinct_pet_food_feeding-_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/4551096344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/rorabijuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/9642019047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7359/1703/files/12746836614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/longman_essential_idioms_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/64356614790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/fijukigexezas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4210/2437/files/nimudaremekudosaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8547/1400/files/canale_8_su_piattaforma_sky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/sefavipawidaduje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA626 5544 bytes
SHA-256: 30baaeee4b5ed176f8baa79c967b45918f9d5f85c30770dd12d5152475738185
font_01_sfnt_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 10304 bytes
SHA-256: e48264d893c67b6bdcf05250eef44bba37f25de5fd3f21276c5afe884a085078
font_02_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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