Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b957da5d1b2343…

MALICIOUS

PDF

39.8 KB Created: 2020-09-20 14:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ded186533ea98306acaab7a21fae64 SHA-1: 944416f689855fab161580d6d22a742afb151a2e SHA-256: e7b957da5d1b2343b5e34c1407d6289c28fa8f0c1d6789410d0af9f71669e4ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to external PDF files. One prominent link, https://ttraff.me/wix?keyword=the+periodic+law+lab+answers, is identified as a malicious redirector. The document's structure and the presence of numerous links suggest a link farm or redirection tactic to lead users to malicious content, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=the+periodic+law+lab+answers
    • https://fd94e753-bfc5-4701-8c56-4467e4b456f5.filesusr.com/ugd/89c6ad_cb3b84fd9d204800b298d922e08159ab.pdf?index=true
    • https://54b81999-bfa5-4cef-a4bd-ff0af1ccccc2.filesusr.com/ugd/067ecb_65a0c428cebc450f9f690b3f7a58e546.pdf?index=true
    • https://89924628-71f2-4530-9c53-93cac3969ed8.filesusr.com/ugd/c34aa9_11314c7a0c4a4e8884fdce5b8367957d.pdf?index=true
    • https://eee5ea1a-5b3e-45a6-b78a-9bc3118e0be5.filesusr.com/ugd/e481ce_ee6979aca5d94b01bbd4e181dfbba758.pdf?index=true
    • https://60a88462-2f55-49fd-a588-19283c36b891.filesusr.com/ugd/1ebe14_742a0d88d3dd48ee8513ffb4dd77755a.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/2415613199.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/no_mans_sky_upgrade_modules.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/sawonale.pdf
    • https://cdn.shopify.com/s/files/1/0464/7092/2390/files/bts_world_app.pdf
    • https://c9714f1b-0675-4f6b-ac94-3c2edd4781c6.filesusr.com/ugd/314c35_2b960a1593ca4e7b96c1cd73ce57f44c.pdf?index=true
    • https://f6339542-8a7a-4c3f-866c-fda44fd28361.filesusr.com/ugd/6cabbb_fba9df7a20e347ce9f01b2fc098d1ec5.pdf?index=true
    • https://8b985f0f-db26-4c03-a2c2-550beeb12668.filesusr.com/ugd/7be1cd_e0cc9c8cf1fc45ba8bb23d3bbd3dd35c.pdf?index=true
    • https://43bb6006-fd35-4897-8a54-51777f35590c.filesusr.com/ugd/ae15ca_cfabc64243ae49b99276a528b144992a.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e13.bin
f16e7f354e3b5e1b91fbe35a5cd11acf429008811d9bfb15a66f632ba1b34677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 5344 bytes
font_01_sfnt_off0000703f.bin
a8f8eaa11de7696e6c0b327aaff0b969d7675efeb7e26d7d64d6703a2988ebed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703F 9992 bytes

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