Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25d157bf68832fc…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 12:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d35d6d83e7c47165a84cf9c9274ae93 SHA-1: 8f5d94e6b732259921cb5b8ad77f90280e371f31 SHA-256: c25d157bf68832fc5993d54c15b2351f4e5764c22b294f41eb8c6e9c7dad4452
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a construction manual, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm for SEO manipulation leading to malicious content. The document body itself is heavily obfuscated but contains the primary malicious URL.

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.com/pify?keyword=insulating+concrete+forms+construction+manual+pdf
    • http://files.quetecuente.com/uploads/1/3/1/4/131437680/0b2c0f.pdf
    • http://vibati.beaconcoop.com/uploads/1/3/2/6/132681231/200892.pdf
    • http://files.namiramseycounty.org/uploads/1/3/1/8/131871921/mivebalufudurip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3689/2584/files/tafufirin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dokole.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/33178277088.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/24389688908.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/plastic_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/jefoxutuxuvof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/26153916579.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/building_background_knowledge.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/future_ds2_zip_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/class_11_cbse_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/fokelisubatudasogorafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/tutorial_microsoft_access_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/93768114051.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0898/files/ecologia_y_salud_ambiental.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_off00006fff.bin
eb7eb496480b2e012bd8b0d3c3d00c2f9fcf5c38e4a7610078907180db9a50b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFF 5412 bytes
font_01_sfnt_off00008249.bin
37968bf1cde3814c826d7dcb92fbf2ee81c86ccb37caf9b86c1d010b76c1a755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 12676 bytes

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