Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb25f7847dc353a…

MALICIOUS

PDF

55.0 KB Created: 2020-08-23 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1684dfbb12f2a7c80001847e900a4d9d SHA-1: 5867ad181c9737b79b01ef924df17e18d4c1dcd4 SHA-256: 3eb25f7847dc353af07b90f3587675eb9afca00b2795000ea49f63dc1052ec76
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 a link farm hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=5-+2+bisectors+of+triangles+answer+key', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to a malicious site. The ML classifier also flagged this PDF with high confidence.

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=5-+2+bisectors+of+triangles+answer+key
    • http://files.valleychurchlife.com/uploads/1/3/0/7/130774965/wemamedafeb_metivirokiked_gesob.pdf
    • http://lavito.badassmaui.com/uploads/1/3/1/3/131384169/3a8985181762.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/rokudofodavusedoleka.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/46969602612.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/crawl_game_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/ludifovenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/48712414282.pdf
    • https://cdn.shopify.com/s/files/1/0432/6775/2100/files/xujiviwabew.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/eba_outsourcing_guidelines_feb_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/93603295448.pdf
    • https://cdn.shopify.com/s/files/1/0452/3789/5325/files/99292310712.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/72454449140.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8791/files/82392908919.pdf
    • https://cdn.shopify.com/s/files/1/0443/1160/9500/files/financial_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0301/0468/files/fomijizorabuvixila.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_off000070d0.bin
72ece9eb70b7f00cd937b7eef3c66bed08bb660a38d724588b800692ad22a8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 5640 bytes
font_01_sfnt_off000083ef.bin
be917c0db7373273820b965e09a90eb2fe17fe2eb699b6f9fe1ec8b3b19cfce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EF 6168 bytes
font_02_sfnt_off000092dc.bin
8e3e3342ed8a96591e97b0a1d2f297f55dd575a947f97a84389105dd80a3188d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DC 11672 bytes
font_03_sfnt_off0000b9e0.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 16072 bytes

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