Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc6b70985ba80b2…

MALICIOUS

PDF

34.4 KB Created: 2020-10-02 04:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b1490ed5f6dc5142bbb309e194d812ac SHA-1: f846f2f19634c688db422e90f724ec18778ae59f SHA-256: fcc6b70985ba80b26d7e8dac48cca57d01f10241ce4242ce2f01dfd36a9b08da
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or link farms designed to host further malicious content. The document body, though partially corrupted, contains text related to 'daily reading comprehension grade 7 answers' and includes the primary malicious URL, suggesting a lure to trick users into clicking through to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=daily+reading+comprehension+grade+7+answers In PDF document text
    • http://files.shawnchays.com/uploads/1/3/0/7/130775952/b3ade18a0dc.pdfIn PDF document text
    • http://sifanemid.proportionalreasoning.com/uploads/1/3/1/4/131454766/rizotaxi-bujubixivuraxev-nudurelobifa.pdfIn PDF document text
    • http://files.cinetikfit.com/uploads/1/3/1/6/131606556/rijukanile.pdfIn PDF document text
    • http://files.38plus2productions.com/uploads/1/3/2/7/132740234/5607246.pdfIn PDF document text
    • http://fegida.villadenardi.com/uploads/1/3/1/4/131437181/fatuluzovada_tojalaj_tugapij_luzaxadikoda.pdfIn PDF document text
    • http://files.bourbeau-voice-dynamics.com/uploads/1/3/0/7/130775558/ziraful.pdfIn PDF document text
    • http://nitoduza.morehousechicago.com/uploads/1/3/0/7/130775436/moligutotemaretoguto.pdfIn PDF document text
    • http://files.storethewholelistdoc.com/uploads/1/3/1/6/131606273/a27de14.pdfIn PDF document text
    • http://files.popponessetbeachassociation.com/uploads/1/3/2/3/132303407/funedojuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5560/3094/files/25142058199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2083/files/dyson_ball_multi_floor_vacuum_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9638/5957/files/2982968469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4523/1509/files/different_types_of_curriculum_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3596/2785/files/zuvuxelizozizulajariru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2058/files/anime_harry_potter_fanfiction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0118/6973/files/dad_n_me_creator.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47E7 5760 bytes
SHA-256: 936edb6253f3c70ae1b22154bbb165546ed9cca55333e609b06898f4de8ebb28
font_01_sfnt_off00005b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B83 9588 bytes
SHA-256: 6b756471b0b28649c444957b5e6d68a4f7ca20ca6a335da6da1fc448fa390d02

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