Malicious PDF — malware analysis report

Static analysis result for SHA-256 b016a4c494fc31cf…

MALICIOUS

PDF

55.2 KB Created: 2020-08-12 21:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f0ef713e9ef55adbcf2017c765072d SHA-1: b8e356872d3930ad2ae2a49df7b49a8016541392 SHA-256: b016a4c494fc31cfee67e4cba818cb362e1bd2bdc2e76ac068c9f10138f102f9
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=tamil+christian+songs+keyboard+notes+pdf+free+download, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'Tamil christian songs keyboard notes pdf free download', suggesting a lure for users seeking free content. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious redirector.

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=tamil+christian+songs+keyboard+notes+pdf+free+download
    • http://files.dfwdunndeals.com/uploads/1/3/1/4/131453453/difulesus.pdf
    • http://subepisa.charliehubbard.com/uploads/1/3/1/6/131637814/99a0176bf7ef.pdf
    • http://files.hamiltonfoodcupboard.org/uploads/1/3/0/9/130969987/zozuwudemenamejijusu.pdf
    • http://files.sandislandtennis.com/uploads/1/3/1/4/131453902/tubesefopetodubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/papufubokelejurefop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9420/4825/files/buwunodefevutofi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/datitafoguwil.pdf
    • https://cdn.shopify.com/s/files/1/0434/8195/6518/files/75004439249.pdf
    • https://cdn.shopify.com/s/files/1/0436/9793/0393/files/futigala.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/wivivamofuvilapa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9571/0113/files/bunatilosagumiriwonag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/jungle_vibe_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/vifixater.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1588/files/russian_english_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/60154097111.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007f5a.bin
da07e9664bee39aadf8e8a4f669db13c2312c400568aec6f06b1c08d6bd3c9df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7F5A 13288 bytes
font_00_sfnt_off00006b54.bin
4041529bee7dd4a2c929d75e2dc86a03dde651fe2919d3cd9a120c759d3ef19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 5916 bytes
font_02_sfnt_off0000a094.bin
6885ca61632c5a2556fdb072b31d2cf9c1d0e096cf96cc4e75576339a928b2ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA094 14160 bytes

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