Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa249a32a865956…

MALICIOUS

PDF

57.4 KB Created: 2020-08-31 14:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc68e974b5628f1bd201c2df9a16723b SHA-1: 49b4152d879520c0b51c70fbefc4497b8a039cf9 SHA-256: 2fa249a32a8659567f6e8244e9cca2121e84b7467e3c9eeafb7fca794d2279b4
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Aace osteoporosis guidelines 2016 ppt'. This link, https://ttraff.cc/pify?keyword=aace+osteoporosis+guidelines+2016+ppt, is designed to lead users to malicious infrastructure. The PDF also hosts a large number of external PDF links, many pointing to Shopify, suggesting a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious.

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=aace+osteoporosis+guidelines+2016+ppt
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/resipubatiziwunoba.pdf
    • https://cdn.shopify.com/s/files/1/0432/1941/9291/files/46919161341.pdf
    • https://cdn.shopify.com/s/files/1/0463/2241/7826/files/asma_gina.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/nsfw_subreddit_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/16168937196.pdf
    • https://cdn.shopify.com/s/files/1/0431/8711/0037/files/52571204697.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/60381146923.pdf
    • https://cdn.shopify.com/s/files/1/0436/7056/9113/files/pitozifomakeba.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9814/files/22400810199.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/bollywood_song_video_hd_free.pdf
    • https://static.usrfiles.com/ugd/2813e2_d5c1849d8d3845b0b6e31394cfaaf924.pdf
    • https://static.usrfiles.com/ugd/724fb5_d14075e6016d41c8bbd3d20d8d66b89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7381071972346f296888b70f5ad0415.pdf
    • https://static.usrfiles.com/ugd/1d64af_14e6b80ef9a748d79b05d2d5ae5fdc81.pdf
    • https://static.usrfiles.com/ugd/764aaa_abaf39afb67b4f80b4a3dd310f95fd6c.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_7b7d8f3066c449c4a3835dd1415937c7.pdf
    • https://static.usrfiles.com/ugd/3aee12_c21714aaa99f42cca4b09889444fd850.pdf
    • https://static.usrfiles.com/ugd/d3758e_c31687d12e9946b1826d5e86ff1c55a5.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_off00009ff1.bin
caef6ac3b1107a7253733eaac1d9af44441d59466ce8b69e250be0f1946aece1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF1 5712 bytes
font_01_sfnt_off0000b371.bin
680ddd0eb7a2beae25b60f57fb580de25f91dfaf34be8e6cc008e6eab551adbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 10868 bytes

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