Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5df95c9aa791d02…

MALICIOUS

PDF

44.2 KB Created: 2020-10-29 18:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2caceec09698b00d05642660f070e151 SHA-1: b20a8b3293fcbe40cb66a337ac9332f58c9fc542 SHA-256: a5df95c9aa791d0237fb5e92738b8f63975aabac8db401a7993462810ccea3ff
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a link farm and a redirector pointing to a URL that appears to be a lure for downloading an APK file. The heuristic firings indicate the PDF is a malicious redirector and part of an SEO link farm, likely designed to trick users into downloading malware. The embedded URL and the presence of a download button lure reinforce this conclusion.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=aptoide+apk+download+9.0.0.0 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/43206917152.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/tudawerufatogirigis.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bacteria_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/sbcglobal.net_email_settings_for_outlook.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/mcalister_s_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/gibeziluxupuwotefol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/9347/3688/files/lock_screen_security_with_fingerprint_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8980/5983/files/wisconsin_state_prevailing_wage_rates.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/oster_blender_564a.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/baja_autoestima_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9371/0743/files/elemental_shaman_leveling_guide_legion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2620/5848/files/46211559460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/1502/0200/files/furuponukunadosekude.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/automation_framework_in_selenium.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/forunojagadipo.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBE 5152 bytes
SHA-256: a45f58db1e7c740f925726506f26eb830086c8f169fcd5306ca13617912a080d
font_01_sfnt_off00007e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E78 10916 bytes
SHA-256: c2ec433e8696d8683f6761529aed09192d7304135222bc2f8cca08effb59c226

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