Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22f13e129f9cf9b…

MALICIOUS

PDF

39.4 KB Created: 2020-07-08 11:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: afa727e185d4ba8190c83d609fcde85c SHA-1: 4c401d85c7f1cc86b2b253765e92e318ee2f41f0 SHA-256: b22f13e129f9cf9b4c754e338a1b353eceefb4c02690968ac73f20b495b61862
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains hosting PDF files. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body text, while garbled, contains keywords related to 'Alberta program of studies language arts pdf' and includes the primary malicious URL, suggesting a lure to download malicious content disguised as educational material. The presence of a visual download button further supports this phishing-like delivery mechanism.

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://ttraff.cc/wb?keyword=alberta%20program%20of%20studies%20language%20arts%20pdf In PDF document text
    • http://files.outdoorkindergarten.org/uploads/1/3/0/9/130969887/jexinipaninupexazoz.pdfIn PDF document text
    • http://files.beeffoundation.org/uploads/1/3/1/6/131637034/dadigaguxa.pdfIn PDF document text
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdfIn PDF document text
    • http://files.islandscounseling.com/uploads/1/3/1/4/131409055/8e3ce1394.pdfIn PDF document text
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdfIn PDF document text
    • http://files.rickrebelsrock.com/uploads/1/3/2/6/132695839/8171851.pdfIn PDF document text
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdfIn PDF document text
    • http://files.schombergcommunityfarm.ca/uploads/1/3/1/3/131380868/c3c31a37f78ec7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://buluzoti.files.wordpress.com/2020/06/ledavuno.pdfIn PDF document text
    • https://webarita.files.wordpress.com/2020/06/renibapepuratewema.pdfIn PDF document text
    • https://bijojaraduk.files.wordpress.com/2020/06/zevalisovixolagufajanoj.pdfIn PDF document text
    • https://wopigumu.files.wordpress.com/2020/07/70516964235.pdfIn PDF document text
    • https://xidufunamopa.files.wordpress.com/2020/07/87946626332.pdfIn PDF document text
    • https://pekuzapodomi.files.wordpress.com/2020/06/90752642236.pdfIn PDF document text
    • https://pugidide.files.wordpress.com/2020/06/32616659351.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_off00005cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5372 bytes
SHA-256: ca8ebd28c1a803d6d868fdd363a0da0d96cfdd0614e743b9739c10a31ba78362
font_01_sfnt_off00006ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 9992 bytes
SHA-256: e605742e4f47a0fcff60c0981c8aa12bd6659a82dc410d9224404a33dbdf7def

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