Malicious PDF — malware analysis report

Static analysis result for SHA-256 61807daa70d4a872…

MALICIOUS

PDF

57.2 KB Created: 2020-08-31 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c1ba3d8f2d1655bdbd46d36eabfe76 SHA-1: 86304cf1a774302b29807f02cc252ff2a835fe0b SHA-256: 61807daa70d4a8724b5df220c7b8b0b5d55a69b3b3d28c80ac9447adab45a7e1
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.com/wix?keyword=bactris+gasipaes+pdf. This technique is often used to obscure the final malicious destination and evade initial detection. The ML classifier strongly indicated maliciousness, supporting the presence of a 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/wix?keyword=bactris+gasipaes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/yasuko_kawamura_face_lift_normal.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6396/files/croom_algebraic_topology.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/87882663124.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/definition_of_human_development_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/tozobororoxeninanapabud.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ea06ee8763242819b6ad57a77c297b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4aa6b52ad8c4f63ba4bd253b9a4b068.pdf
    • https://static.usrfiles.com/ugd/23e9be_2946fd209aa9449bb5e184d1626865be.pdf
    • https://static.usrfiles.com/ugd/f103bb_96e4cb99aedd47acbee6d168f2cce217.pdf
    • https://static.usrfiles.com/ugd/b8c837_13281f00f0d746fb824f14a438d82bfa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/83224269062.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/ardas_song_mr_jatt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009235.bin
2d4b5e39081ab053bce5629ee7cf48ae21992511655b9afc1a34a5597d746e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9235 4912 bytes
font_01_sfnt_off0000a301.bin
1061b5510b74a8f5a214e26dc7c398fe5be0c26e6fc65f381280d3f1296a5a55
pdf-font-stream PDF embedded font (sfnt) at offset 0xA301 12172 bytes
font_02_sfnt_off0000ca82.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 4324 bytes