Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bec4c1ca226e6b1…

MALICIOUS

PDF

42.3 KB Created: 2020-09-17 01:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efd42c248eedb3046eed301cf43893c5 SHA-1: fd3d7467fb5b6c785737f34414a688ffa68bdf07 SHA-256: 7bec4c1ca226e6b1dd46665cb241b8844b3902fae25a38ea384e8d3f3adc45da
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. 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=the+mystery+of+edgar+allan+poe+worksheet
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/wufemewosofudiluteleviwu.pdf
    • https://cdn.shopify.com/s/files/1/0461/1325/9683/files/azure_storage_blob_python.pdf
    • https://cdn.shopify.com/s/files/1/0462/1503/7082/files/drum_notation_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/asterix_francais.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/ilae_definition_of_epilepsy_2020.pdf
    • https://09c68665-aea1-48b7-b053-415ce804c13c.filesusr.com/ugd/9ff9b8_74492b44cfd049c5b1beea831b143a04.pdf?index=true
    • https://dd127f2f-07fd-43c4-802a-87b5434b0a7f.filesusr.com/ugd/ca32a8_0f74cbf4fc0744229322d246e5259ec8.pdf?index=true
    • https://9db8db56-a3eb-43eb-a944-ab43dcf2e5be.filesusr.com/ugd/e3ed1f_08a332731f5740d0bfb478456ff9c197.pdf?index=true
    • https://052422cf-129b-4cd7-8cd3-12fc3ceb679e.filesusr.com/ugd/3bcfef_32812095ac56408397f8524092563803.pdf?index=true
    • https://9497311f-621c-405b-9dc7-13ba3c954ede.filesusr.com/ugd/8acad3_66a764958c504fa9a773c98eb5ae1cab.pdf?index=true
    • https://86063f2a-89c3-499c-92bc-296ce9aed542.filesusr.com/ugd/7921d2_e07296b726994c7ca5ba165062c2291a.pdf?index=true
    • https://34d1dee0-0bb4-4f8e-b630-70939896c45f.filesusr.com/ugd/f68081_b20cbde919a1489f97574062c0955c21.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b6.bin
554e90a93505698060821d054a1d08a52fb5d8bcaff3124500f0ad6b7c4ce109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B6 5404 bytes
font_01_sfnt_off00006b06.bin
3421c22a64c194e19e428ee43cfea0824dac1d3ef8b37f8649bb02ffab857c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B06 10348 bytes
font_02_sfnt_off00008e5e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 4324 bytes

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