Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d34d133244640…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 11:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31999f2469c2a58f821a3a99b390b2a8 SHA-1: 6cfae19406dd30f9c68574743cc8e842e5fbc5a3 SHA-256: b89d34d13324464054a342140fdd8b8e8cb32bc1ac0ab83bce7275d0444875a8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=nouveaut%25C3%25A9s+en+curieth%25C3%25A9rapie+gyn%25C3%25A9cologique+nouvelles+technologies'. The document body, though partially corrupted, also contains this URL, suggesting it is the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign Shopify domains, likely for SEO manipulation to increase the visibility of the 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=nouveaut%25C3%25A9s+en+curieth%25C3%25A9rapie+gyn%25C3%25A9cologique+nouvelles+technologies
    • https://static.usrfiles.com/ugd/cac9e4_06182a46e5f144e6b303d8e6bdb361b6.pdf
    • https://static.usrfiles.com/ugd/f523c3_8a8f11f3e2f442b4a2faeac3dc755028.pdf
    • https://static.usrfiles.com/ugd/856cea_4581293a3fca4a8b993afeff0fc6a58b.pdf
    • https://static.usrfiles.com/ugd/b444d4_26e71ac5605f42b0b48da229db3a0623.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/grooveshark_playlist_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/dipek.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8918/files/frigidaire_stove_manual_self_cleaning_oven.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/budgeting_control_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7645/files/cervical_spine_rehabilitation_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0462/6802/2941/files/mopefa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/lebigaluxefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/vexekasipifanidavixuxir.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_off0000659b.bin
9bb29e068b50656a4acea5ce4e1fa0b1e51c3f7233c069ce7b120f8fd2a762a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 5596 bytes
font_01_sfnt_off00007862.bin
a4e28751750651dd9c8d911f9c5cae1f999f37c1012de335e0e9a5ebe03bf202
pdf-font-stream PDF embedded font (sfnt) at offset 0x7862 11936 bytes