Malicious PDF — malware analysis report

Static analysis result for SHA-256 7684601ce71aa7e9…

MALICIOUS

PDF

38.8 KB Created: 2020-10-29 19:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c91fe1dbf3226b134ea33ef871e1f2a SHA-1: 2bdf547f31e7f18aeaa8d5f11438ccf4d89628b7 SHA-256: 7684601ce71aa7e91cbe98463071234363b82aa9c96da1e3554a8ec4475d19e0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.club/123?keyword=lasko+digital+ceramic+heater+with+warm+air+motion+technology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8d04825286a.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/1/0500/2369/4506/files/swtor_commando_assault_specialist_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4699/3557/files/google_sign_in_button_not_working_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5276/8666/files/63323032412.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/meter_conversion_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6301/7109/files/mijovotagerosituralanud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6259/8067/files/80515932597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d6ebf2-aa79-4dd5-8c63-2ddcb7695477/95822277434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7054/6614/files/27445878922.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/sifejoxefubulewigesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9195/4331/files/76963292843.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/bituminous_road_construction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3011/8052/files/manuales_de_identidad_corporativa_marcas.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_off0000527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 5552 bytes
SHA-256: 6eddff234f533659e1be3aa38589a1716ae70a85b64c6daf7dfe75b89a0f5b91
font_01_sfnt_off0000654e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654E 12288 bytes
SHA-256: 3b0993131c2730e989b3ad083d0dc89abb560648dc724d1ea7b47d386c74e79d

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