Malicious PDF — malware analysis report

Static analysis result for SHA-256 186568c659cd7b18…

MALICIOUS

PDF

40.0 KB Created: 2020-08-15 08:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a8ea736f4455715307b80716eac53b SHA-1: 042e58e463d5d1fef9eec515360d0433370200f2 SHA-256: 186568c659cd7b18704036fa818c33931c83e531c6ac00d64592d11cd12d0ad0
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=christmas+dj+songs++2018'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=christmas+dj+songs++2018
    • http://files.middlingsort.com/uploads/1/3/1/4/131453022/worozefowodu.pdf
    • http://pifiwe.csulbcki.org/uploads/1/3/1/6/131606630/jovax_xaxifajid_mowufu_jasakitusez.pdf
    • http://files.dancetoyourheartsdelight.org/uploads/1/3/1/4/131408369/mafivisi_xonov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/91297740236.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/sociology_a_level_textbook_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/38401202654.pdf
    • https://cdn.shopify.com/s/files/1/0439/2416/0667/files/vatevoputasigage.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/69742963208.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/application_octet_stream_to.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/36716039061.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/fijidodefus.pdf
    • https://cdn.shopify.com/s/files/1/0433/7238/0310/files/lozepokavovarib.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/16863820820.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/wideluparibewoxibeletaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7163/files/11911558083.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4422/files/88037120102.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_off00005dd3.bin
91939e0a626a7e24f4734de8254e17d9db45253001022a8830d041419ed2f0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 5708 bytes
font_01_sfnt_off0000711f.bin
e8508609a726ccceff02c7985797e9aa2063f760782c172822e4f6c0d4e385be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 9956 bytes

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