Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de430af2579b642…

MALICIOUS

PDF

55.3 KB Created: 2020-09-16 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4112f8b83ab42ced98625710e0b0cd5 SHA-1: afa8b2523314eba18761ae0d93ebe67e8a297804 SHA-256: 5de430af2579b642bf90046a03e305f1ae1ee638213fb43638aeb35f279d9614
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings, suggesting a phishing or malicious redirection attempt.

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=the+thickest+layer+of+the+earth
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/dagupavaban.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/practice_act_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/80679830355.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/ripidigiwiposag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1193/files/final_battle_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/puxedebomusateferi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/lubigemajubab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/98430898238.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/44342491822.pdf
    • https://cdn.shopify.com/s/files/1/0441/1172/4696/files/50966493669.pdf
    • https://4af0a01b-7cbc-4e2e-856e-cbe8ecd02381.filesusr.com/ugd/18f527_3d02f6ef78ae46ad9000f6d857408126.pdf?index=true
    • https://f11923d2-8d12-4a17-8c9b-860daa08e33c.filesusr.com/ugd/5f226b_76f7657d87874037a4060fba617bf060.pdf?index=true
    • https://d661aab1-88f2-402c-a6a5-4295e19fc2a9.filesusr.com/ugd/48bf55_fb96224d17e84ff1a84afb3c7a4e0b55.pdf?index=true
    • https://318796e9-f5df-4d91-b5ff-3b7e51262f3c.filesusr.com/ugd/031dda_dbdb3cf1a66941f9bcd308ad99870d62.pdf?index=true
    • https://ec7f8c5b-e812-45f9-9c04-bd55932d52ff.filesusr.com/ugd/8aba0c_df828c41524948689332cbdb82381eb8.pdf?index=true
    • https://70e69bd2-3356-44ec-9d52-819c085a2cf5.filesusr.com/ugd/45fd81_e69e9ce641324aa5ba7c1fa595853c17.pdf?index=true
    • https://80cf1e65-6f51-4fe1-bcb7-d0a3e674410e.filesusr.com/ugd/a4ea6c_b7784cb1ec47451d945df13fc3137bcf.pdf?index=true
    • https://96a92ba2-8eba-4f2b-ba6f-91c7f1ade7ab.filesusr.com/ugd/d43733_50148522d6ed4448838daa20b6bc8871.pdf?index=true
    • 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_off0000992f.bin
ae34e5670769322b522f42a0e35e58a89ef2c2cce50e185fbfb7002042b42d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992F 5084 bytes
font_01_sfnt_off0000aa7e.bin
1e99a932d2295bd4477da934ba317251074d36f875a569c6fad7023e7086405e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7E 10952 bytes

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