Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e22aa449fbdbddf…

MALICIOUS

PDF

43.3 KB Created: 2020-09-10 19:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30281feda03346560ffec246e7ef580 SHA-1: 3786e12228d272460038a62966719947e3bfd00b SHA-256: 9e22aa449fbdbddfc02128c0e57d9ae45aff23d54220b8c33818317dff131edf
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to suspicious domains. One critical heuristic identified a link to known malicious redirector infrastructure, and another indicated a link farm of PDF files. The document body contains text related to 'congruent shapes super teacher worksheets' which appears to be a lure, and also includes the malicious URL. The primary attack pattern involves redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/wix?keyword=congruent+shapes+super+teacher+worksheets
    • http://files.redgroundkids.org/uploads/1/3/1/4/131413718/genagoludanu-fikebudopik.pdf
    • http://files.kategarrettwrites.co.uk/uploads/1/3/2/7/132741556/nevur_logejovumure_lozati.pdf
    • http://files.dougcarpenterenterprises.com/uploads/1/3/0/8/130814283/supofobigi_munatagetoxito_mijagugikik.pdf
    • http://dugizajal.clarissafortier.com/uploads/1/3/1/3/131379591/5c3b617adbf4.pdf
    • http://kogadeki.studio2corning.com/uploads/1/3/2/8/132815828/bitiruji.pdf
    • http://files.theblingbarn.org/uploads/1/3/1/4/131437380/bedinoneruximi.pdf
    • https://static.usrfiles.com/ugd/b8c837_f99bd3d67a4b4b1f82edcba6edde4e40.pdf
    • https://static.usrfiles.com/ugd/a771bd_5ad07fcc69aa47e1903a79b323c2a8f2.pdf
    • https://static.usrfiles.com/ugd/787b0a_23d5fb0494714152bf7488d4b406ec7c.pdf
    • https://static.usrfiles.com/ugd/e4f6f0_c2f7d7741255458cabce33f2e369d0c6.pdf
    • https://static.usrfiles.com/ugd/80fd5d_d09813d16c4645a6ab420b325294556f.pdf
    • https://static.usrfiles.com/ugd/76aeb6_b272e88c09a34320a8b00485429095cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ae98099124d4e1a86b3c9530ce728b7.pdf
    • https://static.usrfiles.com/ugd/d775a9_d2906ccaab944f48b0293a4d692701d6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cdd.bin
109b4499aa223d04c240597b280f67d298797237ac8fce452d45407ce891d5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDD 5224 bytes
font_01_sfnt_off00007eb5.bin
17a09df4c65a39fb08a77c9dbe348691559251853afc42e5d44c81f9986b046c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 9832 bytes

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