Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bb4dc123d15123…

MALICIOUS

PDF

58.3 KB Created: 2020-08-30 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0392d22cabfb14eda12b2e8cc2951e1f SHA-1: 97e0af03f06b09e7fdd9592a535fc5fd42c81fa9 SHA-256: 79bb4dc123d15123ff80ce00075cb149f05fba48b5cdc8612d0fafe018826824
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML classifier strongly suggests maliciousness. The primary malicious URL identified is https://ttraff.com/wix?keyword=olds%252527+maternal-newborn+nursing, which is likely used to lure victims into a phishing or malware download scheme.

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/wix?keyword=olds%252527+maternal-newborn+nursing
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/beyond_the_valley_of_thorns.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/25520171638.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/rigixipofokikunarasos.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/ncert_biology_class_11_morphology_of_flowering_plants.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/vozolome.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/false_ceiling_designs_for_hall.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/miritejunepudikafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/the_complete_contest_prep_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/puladevugikilikudimigixek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/79494428521.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/sunday_adelaja_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9313/files/cell_biology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/equifax_dispute_resolution_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/xinimak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/tilijegemumitavukoxur.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/ravish_kumar_book_the_free_voice_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/l_glucose_chair_conformation.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/11317440084.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097a3.bin
ace05ccd2c599eedc2cc8daf6e128b9e791379982a4e3a485d923541e7f43dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A3 5352 bytes
font_01_sfnt_off0000a9d7.bin
999ad12f022ae5ba1f1c7666cab929fff24e8e2d9c986bc56b09bead86e59bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D7 10516 bytes
font_02_sfnt_off0000cd6d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 4324 bytes

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