Malicious PDF — malware analysis report

Static analysis result for SHA-256 140e09d3795d6c2d…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 02:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4dd8c5fe4e72e1c771331984eadedd1 SHA-1: ea63d3746d0a8946769958f35245734f8faf89f4 SHA-256: 140e09d3795d6c2d9594d785ad2b6b3646d695be6b82bf0435c5610ddee52fc3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted, but the embedded URLs are the primary indicators 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.com/pify?keyword=characteristics+of+computer+graphics+pdf
    • http://files.vacworld.net/uploads/1/3/1/3/131381681/bfafcb.pdf
    • http://files.kelsrodreel.com/uploads/1/3/0/7/130775342/fagurufuwikona.pdf
    • http://files.highlandgamesacademyscotland.co.uk/uploads/1/3/0/7/130739169/df07887a3b335.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/kupujabofem.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/barorreceptores_arteriales.pdf
    • https://cdn.shopify.com/s/files/1/0435/8144/0168/files/47205010622.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/wakinusazeregov.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/37202429927.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/wileribibofuden.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/tidokeremupoliji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6720/files/durham_county_inmate_population.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/vediz.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644e.bin
71f2d553cf40916926eb13dd0342df95abcdb3fd63fceac41bfa696cc08700d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5440 bytes
font_01_sfnt_off000076a1.bin
d82d57bc95ac9142f83f20ccafb2fff0a69e5766e9c39bd33e5b46f031f85907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A1 12092 bytes
font_02_sfnt_off00009d58.bin
0d7b5de48ff5001cbee3948371e67b6999b3c8dc9da2328298d75d3db101b009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D58 16040 bytes

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