Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f10a752b7dde25…

MALICIOUS

PDF

44.6 KB Created: 2020-08-10 16:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7e480fecc800c3284fe72d9756faaedd SHA-1: 7faec5b636915738c7b56ba4b10b9d1b3a5f1294 SHA-256: a5f10a752b7dde25cbf92b4614e4a794896f45a6ca7be8065b0c1eaed8443db3
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/pify?keyword=astm+d638+03+pdf In PDF document text
    • http://files.sefha.net/uploads/1/3/2/3/132303068/kitelejizimimokuzaxa.pdfIn PDF document text
    • http://files.madonnaforinspiration.com/uploads/1/3/1/4/131437061/fovezez_zevorurakowulen_tulinisepekaku.pdfIn PDF document text
    • http://files.vargislab.com/uploads/1/3/2/6/132681443/boxezisaru-rajoxum-gaduvoke.pdfIn PDF document text
    • http://files.kennethzinkl.com/uploads/1/3/0/8/130873941/5560329.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/1/0427/4411/9462/files/tanat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/77830340420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/84457762505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/mexerujesekotegapujog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3058/4213/files/mathematical_physics_for_msc_1st_sem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/kevuvalibejoniwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/86838001269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/rukuzikid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/simipirabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/97809776565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8251/4585/files/financial_accounting_mcq_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/padij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/magazine_cover_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/printable_calligraphy_paper.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_off00006d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D94 5492 bytes
SHA-256: 9a755ae00b26d111a1114f150769f85f561430681d2a100af501b74fc681eeaf
font_01_sfnt_off0000802b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802B 10928 bytes
SHA-256: bcffbb32a679701dea97b95b1ce3f3252f7f4aebc1e71f6ab99a4606d19520b5

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