Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1a6ca25a6bbc48…

MALICIOUS

PDF

40.1 KB Created: 2020-08-29 17:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2793a7de6c00ffcb34d0c313e659f3cd SHA-1: 73bd92543c877fcaf0d75639c2f13051832358de SHA-256: dc1a6ca25a6bbc48a03437f96d81f9829e11fce409856effd1b1a7d64341fdf9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a download for 'Los sims 1 gratis'. The document also hosts a large number of other PDF files on Shopify domains, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to 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=los+sims+1+gratis
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/punjabi_song_free_downlord.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/55860963692.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/nutrition_parentrale.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/best_android_emulator_mac_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/7011/9318/files/dolitovomola.pdf
    • https://cdn.shopify.com/s/files/1/0443/0387/6252/files/wikawedupupesitapifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/script_fonts_free_for_mac.pdf
    • https://static.usrfiles.com/ugd/63d3ad_68bdaa1186834dd58743ee9fd049f161.pdf
    • https://static.usrfiles.com/ugd/b8c837_d425d4761e074087b1b98244ea59af43.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1584a88629b41319ec3c2f91c7583ef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/antigona_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fanujaxolefemonepagipomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8506/files/search_fors.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/10882039261.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_off00005286.bin
c831c0099bffbf94db1c9580b4cb35a0384fd9e709a536bff0a7677d877bee30
pdf-font-stream PDF embedded font (sfnt) at offset 0x5286 3312 bytes
font_01_sfnt_off00005e4a.bin
41bf004258107811d7c9cdb04d2e7edf0e8925e488b5aee97c6a7f71ae7a1762
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 4968 bytes
font_02_sfnt_off00006f20.bin
04e02a3d67c66fe74c67a255c15bc6fdb5458ab5ad47532340266bdc2e9e189d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F20 10776 bytes