Malicious PDF — malware analysis report

Static analysis result for SHA-256 8476f68584c2c558…

MALICIOUS

PDF

37.8 KB Created: 2020-08-23 16:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e8e4c8c5adfcc7fa466bd7b60823f1 SHA-1: c0bd10d5612f6213c522c931a08b8ad14d0d1e64 SHA-256: 8476f68584c2c558ab75eb0b249cde8d07a4ac50e4ca832f401706b303970ef5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to lead users to harmful content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=solving+linear+equations+with+fractions+worksheet+kuta
    • http://files.nettlegrellier.com/uploads/1/3/1/1/131163898/nomotojadamako-kasewikajub-zuzezof.pdf
    • http://files.patriciagriffinceramics.com/uploads/1/3/1/3/131383982/mevomijupul_samenapep.pdf
    • http://files.kitchenideascookshop.co.uk/uploads/1/3/0/8/130873983/fopejiwefewas.pdf
    • http://files.alliance11.com/uploads/1/3/1/4/131438003/6345723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/what_is_ontology_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/51942538820.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/medawarepuxoponipu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/lakiwowikuzumesolokanusi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/competitive_book_of_agriculture_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/61160732714.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/couch_to_10k_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/2942/8384/files/discussion_method_of_teaching_and_learning.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/wow_mop_assassination_rogue_pve_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/4453260517.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048bc.bin
7d752776beb44398b0f2f42f78699679e5aded7ecf5dd614d965a788dc053790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BC 5468 bytes
font_01_sfnt_off00005b5e.bin
85de52b8219efd51b47273e5a566f283b46e1187cec0c4d200aad6924c8b88b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5E 9452 bytes
font_02_sfnt_off00007bb7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB7 4324 bytes

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