Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04e2c8e5a65f542…

MALICIOUS

PDF

82.1 KB Created: 2020-08-11 13:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee8d0eee218a5e3229604f875ca13bbb SHA-1: 71ecb67cc693f1a953ea109aca249847f580e2bf SHA-256: f04e2c8e5a65f5426651b8e7c4da35ce6d06d8648adf18246537aa22c8315e2c
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a phishing or redirection attempt. The embedded URL points to a redirector that uses a search query as a lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs and the document's structure suggest a phishing attack.

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=chaucer+canterbury+tales+middle+english+pdf
    • http://files.saintanastasiaschool.org/uploads/1/3/2/3/132302749/miwasodafe.pdf
    • http://files.olpmiddleschool.com/uploads/1/3/0/8/130874300/besovu.pdf
    • http://files.reviverestorativeretreats.com/uploads/1/3/0/7/130775292/relawaparu-vurabovukef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/zadik.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/femefofab.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/seguzesetojejekewonetu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9396/5466/files/addition_worksheets_for_kinder.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13002849425.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/19390501455.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/domobi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/8851750209.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/dejaforukejufepajegebel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/zusisibomofem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/levogimulatejugezapizoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/86344397584.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/nikola_tesla_biography.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_off0000ebe4.bin
b4f4c06e86cbb3b8c1d401d6b2d97a0ae988223f0e87cd83626cdf4872879778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 5716 bytes
font_01_sfnt_off0000ff2a.bin
ad091f1c15fa491f9c544e77bf05a1825614dfa1cafcd8b8d7d858402b06a01e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 11496 bytes
font_02_sfnt_off000125cc.bin
1be743c11efd1db6eb0b1d59ff599fce1244630bd3a52e256ed85df637fffceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 16100 bytes

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