Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd971a14ff07f55…

MALICIOUS

PDF

84.4 KB Created: 2020-08-11 00:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31768b241d07dd7cba65f9c5728f11a SHA-1: de19a5aa6e258470bf5a2a7419834b7dfd5720ae SHA-256: 7fd971a14ff07f556876d50bdeb2f6e0a8a1136a20645c2c05a57f329476e012
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a malicious redirector link. The document body, though heavily obfuscated, contains text that appears to be a lure for "Carnatic music basic lessons pdf". The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack. No scripts were extracted from this sample.

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=carnatic+music+basic+lessons+pdf
    • http://files.vizadvantage.com/uploads/1/3/1/6/131637656/fegutom.pdf
    • http://files.geekyteas.com/uploads/1/3/0/8/130814208/xazusogitizi.pdf
    • http://files.rachelsvineyardtucson.org/uploads/1/3/1/3/131383664/0714680.pdf
    • http://files.hwschools.org/uploads/1/3/1/8/131872015/napimewidudezufora.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/kulasekosawata.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/92388107369.pdf
    • https://cdn.shopify.com/s/files/1/0429/6753/1673/files/narexef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/savesajuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/lezexufagapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1123/6259/files/wiwakudugasozaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/28991068394.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/69704222773.pdf
    • https://cdn.shopify.com/s/files/1/0429/4210/3719/files/76281250288.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/tazuzixezevuvenoxiwazuwuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9287/7217/files/xazazovexafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/va_form_28-_1900.pdf
    • https://cdn.shopify.com/s/files/1/0434/4928/6817/files/fara_jaca_song.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c8.bin
3513f45715bf01d7074a899630bce7cc99a91e3625548834713f3f1cbb06568c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 5344 bytes
font_01_sfnt_off0000f3c7.bin
e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 3772 bytes
font_02_sfnt_off0000ff6b.bin
8acc2bb4790d67698597e6f2daf82b7780ab98a6d53e67dce31e958443ca47a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 15820 bytes
font_03_sfnt_off00012dc4.bin
4fe341a775eaa784462d361aa27b19d0442bf7ea81a88a171e1aa6e5c59ad1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 6176 bytes

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