Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd8e369f133902c…

MALICIOUS

PDF

36.0 KB Created: 2020-08-03 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e877c1f21756761d706c232f5d3afac SHA-1: 310e79303171d5f75528ae35ab0d6966cd1a041c SHA-256: 4bd8e369f133902c7c9fb9e35b61bb81e558b288ad84b48f0719eb1b0f03d387
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Nortel networks phone manual t7316e' and the malicious URL. This suggests a social engineering attack aiming to trick the user into visiting a compromised site.

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=nortel+networks+phone+manual+t7316e
    • http://files.tangns.ie/uploads/1/3/1/4/131406149/8aa58bd5.pdf
    • http://files.cafeyugo.com/uploads/1/3/2/6/132681771/3a984aac7.pdf
    • http://files.shahnazhomestay.com/uploads/1/3/2/6/132681772/04bef3a2e067.pdf
    • http://zotibet.rockinluxe.com/uploads/1/3/0/7/130739267/becca0999.pdf
    • https://cdn.shopify.com/s/files/1/0435/8717/4557/files/midimor.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/golebegomorilipifusagina.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/97017838361.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/tumirazewakaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/peselalavizosig.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/24822867758.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/wavisutafot.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/pekakodotazexofavarupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/xixajukikoduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/how_to_increase_steam_download_speed.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/sigoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/80348022890.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/rabeliwotijimujulazofux.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/85488722696.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/77008720422.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_off00004e9d.bin
112fd595a3a03cc0a9f11cadc7d6ded8aa07f30408d6c1f0b7d4f0ce11cfe9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9D 5632 bytes
font_01_sfnt_off000061bc.bin
1b2d14bccc0209a0cc7433a6c0d921fec293e9ed3776e412c4e6f5758946d932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 9620 bytes

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