Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb0b531da65d03f…

MALICIOUS

PDF

41.9 KB Created: 2020-08-02 09:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc2fbb2c7b96b9bfe69e6a1f96461d42 SHA-1: 41af91a746f443da02cfccc1b0d0d3caad07c772 SHA-256: 9cb0b531da65d03f3f726f8c38f64e3abf1f5ace543dff5425aa17b7dcc05d8a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a likely attempt to direct users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector link is a high-confidence indicator of malicious intent.

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=discrete+mathematics+johnsonbaugh+solutions+manual+pdf
    • http://files.uuchurchofstockton.org/uploads/1/3/2/7/132710563/0ee64ff.pdf
    • http://files.marquettemountainskipatrol.com/uploads/1/3/0/7/130739500/594fc0bc0.pdf
    • http://files.misoagogo.com/uploads/1/3/2/8/132814048/judimarose.pdf
    • http://files.sandranyberg.com/uploads/1/3/1/4/131406840/jetadowamuxamo.pdf
    • http://files.reneubeauty.com/uploads/1/3/1/1/131163949/e4d7c.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/wejowugifoxid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4433/9861/files/zomipulugozozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/11485053389.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/lukewonig.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/dallas_keuchel_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/8152297183.pdf
    • https://cdn.shopify.com/s/files/1/0430/6475/4325/files/komosodefafasesibimox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4101/files/xomutomuralumewajatim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/vitosap.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/94784879551.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/goximogisetonefifutu.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_off00004914.bin
05a849575a80ada9056290da92972bae97712588aaa5eb30100d00925b7549df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4914 3420 bytes
font_01_sfnt_off00005556.bin
b688df3a0c0ee0ef47989c3e4005622008b102236a0c96169b381ccf30886562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5556 5668 bytes
font_02_sfnt_off0000686d.bin
d45c2a215e2c444f7fa41cc0d1c391b60331b9ab9867c5328703d7dc5e3573c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686D 10624 bytes
font_03_sfnt_off00008ba0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 4324 bytes

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