Malicious PDF — malware analysis report

Static analysis result for SHA-256 637f0d8f98908a4e…

MALICIOUS

PDF

49.4 KB Created: 2020-08-19 06:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a19dcf1b7cbb94c7f6d65f0ab5245623 SHA-1: 585b4d97c4f8652d1613171ba645e1084ecae2a1 SHA-256: 637f0d8f98908a4e18d4b708659aaeaabb0ed2d6b68058887582da309059e5eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'visual studio code json formatter extension' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=visual+studio+code+json+formatter+extension
    • http://files.denaults.com/uploads/1/3/2/6/132696465/c444b1.pdf
    • http://sawis.uscycs.org/uploads/1/3/1/3/131384169/9657684.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/44767792421.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/540019148.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/jifiwuwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/balu_telugu_movie_hd_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0438/3204/9824/files/telugu_movie_bejawada_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/arap_bahar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7045/files/nordictrack_audiostrider_990.pdf
    • https://cdn.shopify.com/s/files/1/0437/4616/4897/files/91172978034.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/36054124077.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/ata_spec_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/rakanodavakasitolinun.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/zumedererabusume.pdf
    • https://cdn.shopify.com/s/files/1/0437/0314/0506/files/77367795033.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061df.bin
6c2ac0179a076d318408a3e84e6dee7f92aa8231d4cdf5891240593c484b50f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5276 bytes
font_01_sfnt_off000073b6.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B6 2092 bytes
font_02_sfnt_off00007d57.bin
a64782b7bc0f8425fbb8a14f0532538aa6f417f84aa69ead99bcb6a05510a0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D57 10508 bytes
font_03_sfnt_off0000a179.bin
ada5d992eec2c877c099a8d0ce6cd546192fbd5f0f6a018c2527602411a0292c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA179 16576 bytes

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