Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae39fd4908c04463…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 13:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bf24fc890f902f3cc8db29ae3caeb5 SHA-1: e2aa26b94f1f1ce295a46eb0993dbefb6163c59c SHA-256: ae39fd4908c04463e8503549af9a1009ef25e34b3960fa2254bb067249b0e449
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a redirector, which is a common technique for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a campaign to lure users to malicious sites.

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.club/wix?keyword=cult+films+taboo+and+transgression
    • https://static.usrfiles.com/ugd/e42ee3_c6752e5b07264c47afe796cad7cf0d7b.pdf
    • https://static.usrfiles.com/ugd/bae363_e39ef305e7c54ad9a9a4984b3e7a0a45.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ff9ed74dd5844f6a0d44ab43f3b385c.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/low_back_pain_exercise_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/fake_plane_ticket_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/abellio_greater_anglia_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/sufozafipipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/white_platform_sneakers_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/1985/2200/files/8_millennium_development_goals_of_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0462/3453/4037/files/nejotapovizuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1140/files/xalirexabezuxoduwujafeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/82958430144.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_off00005b68.bin
75394196489438437408440dfff7b956ff9a91623e5c9c69bb6f80a19f1f9908
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B68 5272 bytes
font_01_sfnt_off00006d37.bin
895d86a92c5d6c45409954903679e0ffe22b0e90a00fe7ed02495c8f081da623
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 10256 bytes