Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7a994452f996f2…

MALICIOUS

PDF

34.0 KB Created: 2020-08-30 18:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa085521a22020255a5eef4ab51f965 SHA-1: f5141d9570e2294dc4f25f9b942c6302152caae0 SHA-256: 3a7a994452f996f29dcdd2ad2b941021fa2e99cd557f6e4c1e681ab6a8bc5ba1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.club/wix?keyword=purcell+electricity+and+magnetism+solutions`. The document body, though heavily obfuscated, contains this same URL and other URLs pointing to benign PDF files, suggesting a lure to a malicious site disguised as academic 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.club/wix?keyword=purcell+electricity+and+magnetism+solutions
    • https://static.usrfiles.com/ugd/b8c837_fbbe5d7c3b594555a9671ce984d57710.pdf
    • https://static.usrfiles.com/ugd/57c819_3c935e7dd66b4db9b0bd354e99c61705.pdf
    • https://static.usrfiles.com/ugd/34e21e_613cfd87ece141e79457754726590886.pdf
    • https://static.usrfiles.com/ugd/3e9e83_e3df26fb50184c609d64934d3151f42a.pdf
    • https://cdn.shopify.com/s/files/1/0465/2957/7118/files/78818337306.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/fewoxagugi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/blank_weekly_meal_planner.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/dumazumufupugesemejodo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/rozoluduxewoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/javepipafepizazadevuzug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/wodibeto.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/99081758718.pdf
    • https://cdn.shopify.com/s/files/1/0463/1127/6706/files/financial_ratios_sheet_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/identifying_long_and_short_vowel_sounds_worksheets.pdf
    • https://static.usrfiles.com/ugd/565485_51ec12fb96a643dabd3c62750bb599e5.pdf
    • https://static.usrfiles.com/ugd/de65f7_384830fa91fa4636802eace6279fb900.pdf
    • https://static.usrfiles.com/ugd/822ecd_24993cc5478947328a9dfd3106a0648f.pdf
    • https://static.usrfiles.com/ugd/b8c837_14528a42e0e348f6a6ba60112970bfb4.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004863.bin
86ae3d32fecb4bbbaa083c503cfedc6dd4a69627f8c1f703a102b5b4aeb3c35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4863 5360 bytes
font_01_sfnt_off00005a8c.bin
ec751a48855cfebb916831622fa415dad8c0ed64a242b90653ed24ac28a98ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8C 9456 bytes

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