Malicious PDF — malware analysis report

Static analysis result for SHA-256 1749424d74be4953…

MALICIOUS

PDF

44.0 KB Created: 2020-08-13 22:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd496c0bf91e4a7049c90443423b3bd SHA-1: 1adc21473ebb117554601e8be15298d8daddefae SHA-256: 1749424d74be4953843558b7b3bfceaee7b18fd57668a4a89a32e0e55a7de18c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=brownedge+st+mary%2527+s+high+school+uniform. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=brownedge+st+mary%2527+s+high+school+uniform
    • http://files.peaceofmindcolorado.com/uploads/1/3/1/3/131383719/9804295.pdf
    • http://files.artglassforumny.org/uploads/1/3/0/7/130740264/vizivitifazinamezi.pdf
    • http://files.tammystillwaterdogs.com/uploads/1/3/1/4/131407102/b075d7aeb.pdf
    • http://files.hatha-house.com/uploads/1/3/0/7/130776607/c81e51ca3712.pdf
    • http://batirin.emaginedthis.com/uploads/1/3/0/7/130775162/teforaw_kelarevulukej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/kuxuwukorokazabawuzowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7809/files/15150897802.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/empires_and_allies_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/trigonometry_ratti_mcwaters.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9361/files/27306392458.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/53996904715.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/raramuzinixodesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/possessive_form_of_james.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/2728344496.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/46447607454.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/65327090160.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/mulapuputosevazov.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_off0000693e.bin
3bbd7052174a09a4d84549589124f229f08746d5ed4bf1c91d29af3bafed8962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693E 5712 bytes
font_01_sfnt_off00007ca4.bin
7f5d4995b4af166c02a772835256dbc90d2dbe5fd5ca6631935115d8e2f4ac42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA4 11068 bytes

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