Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8ea23a3473fa4e…

MALICIOUS

PDF

55.6 KB Created: 2020-08-12 10:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c95628c75325dccc130c4455c14c036 SHA-1: 44626967f16bf02b0440b4da453e27904e7fe012 SHA-256: 6e8ea23a3473fa4ef23c9d88979302b6c2dae268722ba459d50a67cde70514a6
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure for free programming notes to entice users to click the malicious link. The presence of a link farm and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cc/pify?keyword=basic+java+programming+notes+pdf+free+download
    • http://files.woodcreekyearbook.com/uploads/1/3/0/8/130814245/673936de50f53f.pdf
    • http://files.mrmichaelmccloskey.com/uploads/1/3/1/8/131871705/6a2f9fbd.pdf
    • http://files.candtquilts.com/uploads/1/3/2/6/132696483/fiberufez-vobole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/angelic_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/34018254373.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/93494387254.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/88999494598.pdf
    • https://cdn.shopify.com/s/files/1/0437/2971/5354/files/colitis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/zuvebopipunawudiwonaged.pdf
    • https://cdn.shopify.com/s/files/1/0439/9602/0894/files/requiem_por_un_campesino_espanol_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/4072/7463/files/titiwikunagexatokidoxor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2431/8618/files/doxazosin_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/cuentos_en_ingles_para_principiantes_gratis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d07.bin
59217075596f9593059fda0fb422487b27580d8a20f884836734a23a99631e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 5752 bytes
font_01_sfnt_off00008091.bin
ca8010b485c61054d96baa48925ccbf7f95d0790b1d5cb7988b7368c935cd1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8091 3396 bytes
font_02_sfnt_off00008dd7.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD7 2320 bytes
font_03_sfnt_off00009827.bin
29fad7bc5081a472fb0019f5a9d93225b8fb7111d2654647c7e43cc072bdcedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 10020 bytes
font_04_sfnt_off0000babb.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 16224 bytes

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