Malicious PDF — malware analysis report

Static analysis result for SHA-256 1935f105239793c2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-30 19:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6e0f0d72cec2fb39907c591af7958f SHA-1: 30e7cd503ccc90fd496c92d099a8f756c2af5459 SHA-256: 1935f105239793c2ccb018fafc281fb3a048fe09e254ecb56c0dfc37993f1d5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.me'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which are benign Shopify URLs but one points to a potentially malicious APK file. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.me/wix?keyword=mens+size+guide+fashion+nova
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3038/0698/files/valkyrie_profile_lenneth_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0306/files/amelie_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/chronic_hypertension_in_pregnancy_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0427/8507/9452/files/sumerian_cuneiform_letters.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/avril_lavigne_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/gisoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/scientific_calculator_fx_991es_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/top_affiliate_marketing_platforms.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/jovukawokugimebex.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/zitutojuwefajiserutokaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/68154275726.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/55543873659.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/5963221247.pdf
    • https://static.usrfiles.com/ugd/e32576_9d694b0171eb4e098a758cd7269e4124.pdf
    • https://static.usrfiles.com/ugd/b8c837_d76afc95570843bbb83e292015836584.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bead4e9c68543a59eed809cbc10e605.pdf
    • https://static.usrfiles.com/ugd/b8c837_b04b151de58545ecbe6dbab3f5d30991.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eed.bin
ce37a1184596e74763bd0231c08963b1dd0ce9d8035aa64dfba2d79e44d8275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EED 5156 bytes
font_01_sfnt_off00007095.bin
83ddd4c033cde5c580a435825f5b2e546b5c404df53a61ca6830090e186e3bf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7095 14624 bytes

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