Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad32a97adb3f7a81…

MALICIOUS

PDF

54.3 KB Created: 2020-08-20 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac8afd5986b821b652fda1c3b41ded0f SHA-1: b5c07e45376afce3931ff2f5df1154a624802e85 SHA-256: ad32a97adb3f7a817f67e00a4ed398c7128f2cd33732b7514945e885f154e7fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

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.cc/pify?keyword=asha+bhosle+songs++mr+jatt In PDF document text
    • http://files.sargadirectory.com/uploads/1/3/0/7/130775025/115810.pdfIn PDF document text
    • http://winezura.showmedental.com/uploads/1/3/1/3/131398244/7263316.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/1/0429/2929/1427/files/66645191581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/algebra_objective_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/zowonofovovenetoxasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botolewapaniwid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/4351/4518/files/catalogo_avon_campaa_12_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/dk_big_ideas_simply_explained.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/85316000788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/skull_candy_mp3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/antibiotic_guidelines_2020_johns_hopkins.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4112/6565/files/nesise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/ancient_history_by_rs_sharma.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_off0000872e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872E 5304 bytes
SHA-256: 807e92f40e6ea80d4c0df67bd766f5910943fb448dc6ef6e2b85af6532bb1d7c
font_01_sfnt_off0000990d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990D 15808 bytes
SHA-256: 6aae8832aaca7712b34ee268d5ef9419858570a1b59705e5aa46dd712e60d733

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