Malicious PDF — malware analysis report

Static analysis result for SHA-256 473bb410f999d38c…

MALICIOUS

PDF

47.5 KB Created: 2020-09-16 02:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6abcae88606f0cf49eb503868716972 SHA-1: f449f5069bfb72b9e51f078696ab01fa3327b63c SHA-256: 473bb410f999d38c1fefe8491d20a0ba21ced6eb5ac46fd6fd6e2f9477f82cc1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/pify?keyword=the+misbehavior+of+markets+free+online', suggesting a lure to a malicious site. The presence of numerous links to static.usrfiles.com, some flagged as benign, indicates a link farm strategy. 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.link/pify?keyword=the+misbehavior+of+markets+free+online
    • https://static.usrfiles.com/ugd/51c472_8d4b486eef384a188c873e06b4f59056.pdf
    • https://static.usrfiles.com/ugd/b65acf_5879875f53654c1085fcb302419360c0.pdf
    • https://static.usrfiles.com/ugd/80c1db_f98791702493450bb0663605a50ac0f5.pdf
    • https://static.usrfiles.com/ugd/405339_1ad52c9442e848a5a3e20d991d54b43a.pdf
    • https://static.usrfiles.com/ugd/f91cf1_13b2e6ac642a4a8c8628d7143b274c96.pdf
    • https://static.usrfiles.com/ugd/09273f_f657aec8c9c144538f1ca2e3c5f53e25.pdf
    • https://static.usrfiles.com/ugd/ad8f3a_1ae0e57627774256bd22c2fd47d0b2ac.pdf
    • https://static.usrfiles.com/ugd/89602e_dd9cc16ce5ac4a739c895a6af20930d4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/sixixemobiviregavefegomaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/instagram_app_for_windows_free.pdf
    • https://cdn.shopify.com/s/files/1/0463/5050/0002/files/fekexugeretarini.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/fundamentals_of_algorithmics_brassard.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9670/files/hdfc_credit_card_closure_form_sending_address.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/paketopavaduvigexesivisu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/vopuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/87461821432.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/78115894465.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_off00007b66.bin
49fcc6133a6e1e608934824769249fc82c348473be6a0baceb6e651af801cb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B66 5220 bytes
font_01_sfnt_off00008cfd.bin
ee240f381917e48e03cb289cd9e4d43ffe6a8bfeae0cff07502234abc92f4f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 10644 bytes

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