Malicious PDF — malware analysis report

Static analysis result for SHA-256 675faef00a971fcf…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 00:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f68d163dae8a66d0639161226b5570d SHA-1: 8f2d7d61a02a3c58e7469ca4b68c0cb06a326849 SHA-256: 675faef00a971fcfd03e8dd3f1eaab813eaa4e4515cf3f5f672814769112731c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One of the primary links, 'https://ttraff.com/pify?keyword=cephalohematoma+vs+caput+succedaneum+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malicious redirection attack.

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.com/pify?keyword=cephalohematoma+vs+caput+succedaneum+pdf
    • http://sixap.learnwelshnow.co.uk/uploads/1/3/2/7/132740285/1943737.pdf
    • http://files.commandcg.com/uploads/1/3/2/6/132695714/limokonof.pdf
    • http://files.litchfieldarc.org/uploads/1/3/0/9/130969761/1465000.pdf
    • http://files.greyhoundadoption.ca/uploads/1/3/0/7/130776386/aadf631cbd83243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/tabla_de_derivadas.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/walobedodisukuvav.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/set_theory_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/support_vector_machine_kernel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/67133189184.pdf
    • https://cdn.shopify.com/s/files/1/0435/3058/4213/files/gofugazenuzax.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/karawisitufasodofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/54391551670.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/fipawovutixowu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5906/7557/files/zogaganugafozoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/lista_swek_angielskich_b2.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/51454949272.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_off00006fb5.bin
7bff6774540d682ceebd8fa1bd08921ec88959741ac03b8613df947a77b375bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB5 5264 bytes
font_01_sfnt_off00008188.bin
ebb980b41b673495091c7b8aad60e8153645267ce2b7b148abc73c325e7a3d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8188 10352 bytes

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