Malicious PDF — malware analysis report

Static analysis result for SHA-256 6517a9a971ba0743…

MALICIOUS

PDF

40.5 KB Created: 2020-08-09 13:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 508bc2a998839ecccd4fea91c5246435 SHA-1: c528fafb4571a5942809542f7184d2c51c2be6a3 SHA-256: 6517a9a971ba0743af918b80ed04057d522d68221b6ef4537c17b5cadaaa134a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, disguised as a free book download. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malware or phish users. The primary malicious IOC is the redirector URL.

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=the+adventures+of+tom+sawyer+oxford+bookworms+pdf
    • http://files.theshiatsuroom.co.uk/uploads/1/3/0/7/130776343/999362.pdf
    • http://files.performaxbunbury.com/uploads/1/3/0/7/130776407/5057878.pdf
    • http://files.topthispizzacrusts.com/uploads/1/3/2/6/132695829/rujibopatu_pudoruvomenodek_xitujajimaxet_tixoxe.pdf
    • http://vugalowik.ginaorlando.org/uploads/1/3/0/8/130813528/nokojonipu.pdf
    • http://juxes.kasaainc.com/uploads/1/3/0/8/130814328/42adbdd59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/candidiasis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/lutoxitakuvenejibix.pdf
    • https://cdn.shopify.com/s/files/1/0436/9999/4789/files/92239423158.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/cantos_del_camino.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/batogenanixapavodoboda.pdf
    • https://cdn.shopify.com/s/files/1/0428/6464/0159/files/91429271132.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/delta_shopmaster_band_saw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5562/files/taxux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/vupap.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/vopapinuzatuve.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/isometric_to_orthographic_drawing_exercises_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/convert_large_to_word_document_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/39672168255.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/93700059995.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005acf.bin
fd316dc7cedcc73fc05f9cb9477e38d0851fd14463191d01b2e93e2f2b8c5c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACF 5724 bytes
font_01_sfnt_off00006e33.bin
17f5bd9a1cf576f600faee6d93e9447fcab97f195a57ba4e78246d814980efc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 13108 bytes

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