Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8526f02a317194…

MALICIOUS

PDF

38.7 KB Created: 2020-07-08 12:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 3803743e7a1d272c2c3e1f60890c12eb SHA-1: b8d51947139070ececb52770f450081148073790 SHA-256: bd8526f02a31719489940f38145a5894fa6895bf784c9a9cdd26067292de67ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of a link farm. One prominent link redirects to `https://ttraff.ru/wb?keyword=community%20medicine%20park%2025th%20edition%20pdf`, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text and URLs that suggest a lure for downloading a PDF, likely to lead to further malicious activity.

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.
  • 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.
  • 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.ru/wb?keyword=community%20medicine%20park%2025th%20edition%20pdf In PDF document text
    • http://files.ryanstander.com/uploads/1/3/1/4/131454850/gilotew.pdfIn PDF document text
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdfIn PDF document text
    • http://files.mashed-up.net/uploads/1/3/2/8/132814239/lelorepenu.pdfIn PDF document text
    • http://files.jasminesholisticcenter.com/uploads/1/3/0/7/130740232/pirasisokovaforibifa.pdfIn PDF document text
    • http://files.stribbledistrict.com/uploads/1/3/1/8/131856430/8390719.pdfIn PDF document text
    • http://files.awardmusic.biz/uploads/1/3/2/8/132814239/ce8346bdc25fa.pdfIn PDF document text
    • http://files.wunetserve.com/uploads/1/3/2/6/132696263/tezubetezegeto.pdfIn PDF document text
    • http://files.well-estar.com/uploads/1/3/1/6/131637034/91a0067.pdfIn PDF document text
    • http://files.eastsidepearl.org/uploads/1/3/2/7/132740398/2014968.pdfIn PDF document text
    • http://files.bupiercing.com/uploads/1/3/2/7/132740398/65fc2eb6dd2.pdfIn PDF document text
    • http://files.zionhillbrookshire.org/uploads/1/3/1/1/131163563/silararitipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kusefujavo.files.wordpress.com/2020/07/sikotikadamebapuden.pdfIn PDF document text
    • https://xewilukon.files.wordpress.com/2020/07/84491204590.pdfIn PDF document text
    • https://pulixaxokuk.files.wordpress.com/2020/06/womobajalom.pdfIn PDF document text
    • https://pubizise.files.wordpress.com/2020/07/816000257.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_off00005825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5825 5512 bytes
SHA-256: 78ac03774064361e60f0f6a148f03040ebc5f7883c87abe21b17da14cea1121d
font_01_sfnt_off00006ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 10408 bytes
SHA-256: dedaadc76477891ba799c53fe026889d7c75ad1a42984ab7a26ca510304810a9

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