Malicious PDF — malware analysis report

Static analysis result for SHA-256 b718034d0c04c725…

MALICIOUS

PDF

52.2 KB Created: 2020-08-16 11:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dc58dc100f992578239b2ee82cb897e6 SHA-1: 691aee9433355f97059f790515338d1b69f41279 SHA-256: b718034d0c04c7253c6cd9199e28d8a3b984695446b960c68511ed5dad15db61
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though partially corrupted, contains text related to 'blank sheet music' and the malicious URL, indicating a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs points towards an attempt to redirect the user to malicious infrastructure.

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.cc/pify?keyword=blank+sheet+music+4+4+time In PDF document text
    • http://files.layover-tour-beijing.com/uploads/1/3/1/3/131379919/devisodegi.pdfIn PDF document text
    • http://reguvi.sufiireland.com/uploads/1/3/1/4/131454415/vadigusi_favapemudorejo_zirumured_tisakel.pdfIn PDF document text
    • http://files.withlovezoerose.com/uploads/1/3/0/7/130775191/samixezalak_tiwavesadogewo_fuwujo_jokuwe.pdfIn PDF document text
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdfIn PDF document text
    • http://dumiwora.post39baseball.com/uploads/1/3/0/8/130814674/figituw.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/1/0431/1020/3556/files/pofajivinabewane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1805/0984/files/36840574716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/14520954762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/dexokem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/90748354877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/66356157350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6082/9087/files/laguna_beach_tide_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/mofuwivorufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/napejomilulewibanife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1596/8680/files/serie_axolute_bticino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/sqlite_create_database.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6095/2229/files/57595507396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/54169000765.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C71 6648 bytes
SHA-256: b04e8e91af4d7dc1e3df250761ea8430c10ab75952a8427ac5e4133a07f84339
font_01_sfnt_off00008ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE7 5144 bytes
SHA-256: faea2940afa51deb798c4320401db82649f3b90228b629c3e3a7b11dcf459d5c
font_02_sfnt_off00009e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E44 10900 bytes
SHA-256: 6a5e4de60989df4621635fcf69135792773e7923bc0879cd916603da343c595c

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