Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4adb8717bc9aa77…

MALICIOUS

PDF

38.7 KB Created: 2020-09-03 00:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35fe2620ac8212e1b5fcd7442f84e656 SHA-1: 669badadb9fd4104097eaf54871c73e3d0cc8e9d SHA-256: f4adb8717bc9aa77250c299d5bcd234d9a38757c2e98f91b306fb37ae19007d3
152 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 firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL that triggered the heuristic. The presence of a link farm suggests an attempt to game search engines or distribute content widely, with the primary malicious link being the most critical IOC.

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=analysis+services+ole+db+provider
    • https://static.usrfiles.com/ugd/45fd81_f19a27159ac145158a9b77932464c759.pdf
    • https://static.usrfiles.com/ugd/b8c837_724c1e584b4c452cade4bc34705a6fc2.pdf
    • https://static.usrfiles.com/ugd/96bf9d_1ffa90e46d7842c09661a520e0f7cfa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_230c1e8b6a9d45e997fbecb745af5ea6.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/algebra_1_mcdougal_littell.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/xiwalupidokor.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3699/files/subject_verb_agreement_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4362/6912/files/data_structures_and_algorithms_in_c_solutions.pdf
    • https://static.usrfiles.com/ugd/4d400c_a28fa81bc41c4855a376dd1271f0f80e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8992c6c61f6a4a778ae1079b6b64cb02.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0433/8964/9054/files/54554943839.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/35616582975.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e91.bin
5c7c11f51e3aef1092199dbf1649eff5d1e8533b9c7a315d53c4cd885a98ac61
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E91 5064 bytes
font_01_sfnt_off00005fc6.bin
7b6b0b3a8848d96d9f8597fb67ca99fd265cd9714ce378e34fbc04119dfbb51e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC6 9468 bytes
font_02_sfnt_off0000801a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x801A 4324 bytes