Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac8e454bc7e34a7…

MALICIOUS

PDF

43.7 KB Created: 2020-08-26 11:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e548c3325b6e75498c57f7cd60de17d7 SHA-1: 1a2187e099fb6a7ecfa85bb86f70e308a8a4ab14 SHA-256: 0ac8e454bc7e34a7ae63fa4a7c55aea0e5d3c8aef469a39f0ee3291809942d35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous external PDF links, many pointing to Shopify. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the embedded malicious URL is the primary indicator of compromise.

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.link/pify?keyword=vocabulaire+de+g%25C3%25A9om%25C3%25A9trie
    • http://tamujidi.sssgc.org/uploads/1/3/2/3/132302978/jumaxu.pdf
    • http://files.yestocake.com/uploads/1/3/2/7/132712006/pupigaje.pdf
    • http://pugode.sculptedroots.com/uploads/1/3/1/4/131407233/8f6037.pdf
    • http://files.designyoursignregina.com/uploads/1/3/1/3/131383251/kumopalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/bollywood_video_songs_hd_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/21912098205.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/asymptotes_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/pandora_box_4_arcade.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/bedeweru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/81072534301.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/bozatovarutenuluse.pdf
    • https://cdn.shopify.com/s/files/1/0437/7821/1991/files/evidence_based_medicine_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/9301575214.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/tabela_campeonato_brasileiro_serie_b_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/how_to_read_manga_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0449/5081/4888/files/bawemawuxipanisiwabotuter.pdf
    • https://cdn.shopify.com/s/files/1/0462/2611/2663/files/cache_memory_notes.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_off00006797.bin
db67d6dacd0b9a8c2dcaadcd6aefd1ffb03aad6656e51ea4d31e3ea8ce4bb9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6797 5328 bytes
font_01_sfnt_off00007949.bin
45c21dc799233fdfa2a641de5b8717c9b1fca6bc78264d87b1f2e61c5760a1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7949 11992 bytes

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