Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8caa10560480f61…

MALICIOUS

PDF

47.0 KB Created: 2020-07-08 11:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a79c134054f188376e07c814a66aad66 SHA-1: 85de9fe0f02093a5be6f6250fbd1721727730cdc SHA-256: b8caa10560480f61b19e1bb0f76f46548c494bcdd953270b7ded1fdfa459bd02
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple heuristics indicating malicious intent, specifically linking to known malicious redirector infrastructure and employing a link farm for SEO manipulation. The document body, though partially corrupted, contains a URL that appears to be part of this lure. The primary attack pattern involves tricking the user into downloading a file via a deceptive link, likely leading to further malware or phishing. No scripts were extracted, limiting the analysis of the execution chain.

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.com/wb?keyword=group%204%20syllabus%20pdf%20download In PDF document text
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdfIn PDF document text
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdfIn PDF document text
    • http://files.s-mays.com/uploads/1/3/0/9/130969046/zamesexupe_visowuxo_velakajujubo_sirorefumugi.pdfIn PDF document text
    • http://files.betsykroon.com/uploads/1/3/0/7/130738758/faxib_jidujuxukofu_vovelajod_fujor.pdfIn PDF document text
    • http://files.withoutbordersshop.com/uploads/1/3/2/7/132710575/d9be58fe2f658b1.pdfIn PDF document text
    • http://files.caltempmissionb.org/uploads/1/3/1/4/131409055/bawixe.pdfIn PDF document text
    • http://files.jettiethissen.com/uploads/1/3/1/0/131070488/917363.pdfIn PDF document text
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdfIn PDF document text
    • http://files.mathtalks.net/uploads/1/3/1/6/131637325/ginaderugodupi_dolububoj_zijupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://merefipo.files.wordpress.com/2020/06/5405725988.pdfIn PDF document text
    • https://fadadidigar.files.wordpress.com/2020/06/virazatiliwibinugomewaw.pdfIn PDF document text
    • https://kozaxijewob.files.wordpress.com/2020/06/xufosepixefubete.pdfIn PDF document text
    • https://gonokerobe.files.wordpress.com/2020/07/23502027979.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_off00007b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B50 5124 bytes
SHA-256: 2f2f94928ac6129811deb5afd0a5be5d90d38d45e99f89fdf539ee66769dd344
font_01_sfnt_off00008cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDC 10120 bytes
SHA-256: 0712048a4bdffbd5cf7e363c6489a4f845e2a188a53179f57053e3b94e4d82dc

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