Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1d654bada77a85…

MALICIOUS

PDF

42.1 KB Created: 2020-11-03 09:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7ba87dfecac94357e74eb78892dd8c2e SHA-1: dc412c3e81876c93991c66d882ac908ef3725696 SHA-256: 1f1d654bada77a85e65d76b2989d75b6acf5d60ee1731b7561fc7a746fed3be3
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ricky+sticky+fingers+free+printable+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8f07557fe1f.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/nofoj.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/dugik.pdfIn PDF document text
    • https://zijavenokin.weebly.com/uploads/1/3/4/3/134315340/dukujisunevekowufe.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/kebusolir.pdfIn PDF document text
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/rikiwapal.pdfIn PDF document text
    • https://difiraboveju.weebly.com/uploads/1/3/4/5/134508976/nutonuravo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5f9c5cc72a7fa.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/1/0497/8684/7399/files/wicked_nights_gena_showalter_read_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2960/1178/files/zokuxusox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8268/5847/files/chfi_v10_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2968/8231/files/contour_map_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8077/7373/files/satupikuvuvoseza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6731/6642/files/sim_freeplay_mod_apk_vip.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_off000065b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5680 bytes
SHA-256: f1731374751e08f5079e4058f0d3d8292a6febec4ef3737c1417d4fa739c9374
font_01_sfnt_off00007931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 10048 bytes
SHA-256: f99c554b83c46b6e607a9d66077e61017497b1e521bf8e375fd2f4c4c3c4f66a

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