Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85fa4c87e3f2637…

MALICIOUS

PDF

39.1 KB Created: 2020-11-01 21:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c0f6deb535d450993f1ee9a259500e4 SHA-1: 57eacbe866f0fdc556b5fa0d937f2464f170e0d6 SHA-256: a85fa4c87e3f2637d6b106c372b2e4d26a75e05cb4da85e721e122e350316583
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating it's designed to lead users to harmful sites. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a password-protected archive lure suggests a multi-stage attack where the actual payload is hidden.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=my+singing+monsters+hack+for+kindle+fire In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/af8a746eb10411.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/papedoji.pdfIn PDF document text
    • https://jawokipuroz.weebly.com/uploads/1/3/4/2/134265350/sikeririjarewelirisi.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/pusifos.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/disafetiw.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bademasotud-muwoxob-keruluzaraji-tiwifozexomepog.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/podaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/38122807300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6763/7411/files/6948158207.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/19084020776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1018/1280/files/second_discord_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38936c48-a1fb-4b2e-9407-94ba444649ab/purple_tablet_recipe_subnautica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4dc2c5-d128-4619-b263-0d97cbe0a118/farin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/please_do_not_hesitate_to_contact_me_synonym.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 8

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_off00005b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B75 5608 bytes
SHA-256: 4ad21cad17fd66639af87cacbefda68f85c8c3843c9a8588dc328b641904e82f
font_01_sfnt_off00006e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 9644 bytes
SHA-256: 9a82608728992e4d0e109a104370817cab416ddbaa4d1c2b778672fb002590ce

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