Malicious PDF — malware analysis report

Static analysis result for SHA-256 530b1b91d68484fe…

MALICIOUS

PDF

57.3 KB Created: 2020-08-22 20:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8efd1a8a57f937fb321f21f2b71e5b9 SHA-1: ba56423d7beb1251f826084c4fb00b8ae1323d57 SHA-256: 530b1b91d68484fe84244f90c80bc55b08ebddc5d87d612f1153b4d6822b73e2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to Shopify domains, but one critical URL redirects to a known malicious domain (ttraff.ru). The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a malicious redirector.

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=high+voltage+transformer+mva+ratings
    • http://files.foodfitfaith.com/uploads/1/3/0/7/130739991/korinoxutolelidido.pdf
    • http://guforave.mtzinsurance.com/uploads/1/3/2/6/132681352/tepopiwikuxaxifi.pdf
    • http://zorer.ggcustomsigns.net/uploads/1/3/0/7/130740019/ef9a9f61c.pdf
    • http://tipunos.chemungcountyswcd.net/uploads/1/3/1/8/131857920/7717774816a4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/java_https_get.pdf
    • https://cdn.shopify.com/s/files/1/0433/0261/7252/files/char_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/emoji_stuff_at_target.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/98862911480.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/37252017669.pdf
    • https://cdn.shopify.com/s/files/1/0434/5053/1990/files/50290323773.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/pdf_files_download_search.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/86922675043.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/latest_guidelines_for_hypertension_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/spotify_android_app_quality.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/i_dreamed_a_dream_free_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8489/files/54295604208.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4225/files/94430298159.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/gazelaxoneseluxodi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a33e.bin
0b93d291f47efe5ee7c6e3e3f18cc6c97142031c892753c725bb029c3904c2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA33E 5200 bytes
font_01_sfnt_off0000b4cb.bin
068ad9ccce7c351b359f95f4c6f76dfddf8847d40c0b0c86c63a1a0e8236d675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CB 10236 bytes

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