Malicious PDF — malware analysis report

Static analysis result for SHA-256 b138b9252a7cc0c5…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 10:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e65f6e75a7745b05bbfb21b2547150c1 SHA-1: 2a1970d99603fa51e929fbed949f1c899c67d6d6 SHA-256: b138b9252a7cc0c598592a5bea1143f0b5f597fa31a97f2c24df8f799f7eeac5
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=tyranny+kills+in+shadow+build', which is also listed as a suspicious URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely to obscure the malicious destination.

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.me/wix?keyword=tyranny+kills+in+shadow+build
    • https://static.usrfiles.com/ugd/3eed2b_8a35189d3613456598b4173d67b1975d.pdf
    • https://static.usrfiles.com/ugd/238140_3ef0aa2257904b999d956be4f51be0e5.pdf
    • https://static.usrfiles.com/ugd/4c1554_f718c33f46e94746a620a00cd0cada8c.pdf
    • https://cdn.shopify.com/s/files/1/0429/9020/7139/files/rumusuxerarematojomerom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/seating_chart_blumenthal_performing_arts_center.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/campbell_biology_11th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/83409071355.pdf
    • https://cdn.shopify.com/s/files/1/0440/7748/2136/files/carica_papaya_leaf_extract.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/65428786323.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6694/files/debut_invitation_template_psd_free.pdf
    • https://cdn.shopify.com/s/files/1/0454/3338/9214/files/energias_alternativas_en_venezuela.pdf
    • https://cdn.shopify.com/s/files/1/0437/8551/9255/files/chrysanth_cheque_writer_uae_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/the_tempest_songs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dee.bin
3a92b2be50eb97f2f26c4f8147736f8d5a086d6bfa29416e2d898155090b8686
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 5260 bytes
font_01_sfnt_off00006fd9.bin
5c1fadcf09cbb50ec4cfed970d64e36a41f96ddde19da2145f91437387a95a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD9 9908 bytes