Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c823784f54d0165…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 14:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449a53fb19600d2ec1a6e67080f7d5f6 SHA-1: c6c2f0eed789aca815051d690385731f002a0170 SHA-256: 5c823784f54d0165f72a04c06e38c43ace4766524f2c92d5f356b562c19b37dd
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains a URL that appears to be a lure for downloading a PDF reader. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.cc/pify?keyword=baixar+pdf+reader+foxit
    • http://files.nowallsneeded.org/uploads/1/3/0/7/130776661/kumovotadinosoj-nufopuxotovor-foxaz-jasireke.pdf
    • http://files.federicoferramola.com/uploads/1/3/0/7/130739986/85d03268a7fcc.pdf
    • http://files.scholacincinnati.org/uploads/1/3/1/3/131383934/844046.pdf
    • http://vunotep.ridemchorses.com/uploads/1/3/2/7/132741593/wopidumafepolebiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/bicsi_tdmm_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0418/9096/files/rugupekot.pdf
    • https://cdn.shopify.com/s/files/1/0444/6240/7847/files/algebra_baldor_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/4970/5881/files/68455532340.pdf
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/vrischika_rashi_2020_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/zowewevos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/futawatijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/80811021516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/ruluget.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/foxotegumobe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659c.bin
18913396fa865d5b608916ad52208b46605dccbe3730c7e7a8b0f54f8e8a6204
pdf-font-stream PDF embedded font (sfnt) at offset 0x659C 4944 bytes
font_01_sfnt_off00007683.bin
2141493cf22b0757b5973de7ebab2626c240f53656d929b5ccd0670db1fdcd9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 11240 bytes