Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea464ff4ec09dba…

MALICIOUS

PDF

54.0 KB Created: 2020-08-24 20:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2393446e310907c2e826b0e5dec2bd3b SHA-1: e2a7c9cd1cd382cad4fc3046e875491fb77a5060 SHA-256: fea464ff4ec09dba7ac8196632ff48e823545183f5b270114d2de3120a2bb056
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=aminoacidos+pdf+quimica'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=aminoacidos+pdf+quimica
    • http://xaluf.liamcknight.com/uploads/1/3/1/3/131398455/kodelamado.pdf
    • http://files.thecapitolschool.com/uploads/1/3/0/8/130813429/jekokulugitoji.pdf
    • http://files.artisttalkmagazine.com/uploads/1/3/0/8/130814280/687fd399.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/89359477017.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9460/files/49929505494.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/5207286888.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/raising_self_esteem.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/59881834955.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/24070288352.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/balance_body_pilates_reformer_iq.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/new_english_file_elementary_teacher_s_book_slideshare.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46283819311.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/transformadores_de_alta_frecuencia.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/lobowurusosunibovitagadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6314/files/puzuzarapubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/best_free_tv_show_app_for_android.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_off00007ccf.bin
f58b432e6240c6031db8387eeae88e7a5ef11380de1f059f7f5864de5c5eadd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 5288 bytes
font_01_sfnt_off00008eb5.bin
3455a7206489e63584f6f3cc2c1f9c5952ecb3186cd48588267ddcc3e7872873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB5 11980 bytes
font_02_sfnt_off0000b50f.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 16204 bytes

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