Malicious PDF — malware analysis report

Static analysis result for SHA-256 2455469d861b84aa…

MALICIOUS

PDF

40.4 KB Created: 2020-09-04 13:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c231eb01f5c9f8bdc5ac7c70accc72be SHA-1: ad0ffca25a388ddbe627db9ec06f83b1046c56c5 SHA-256: 2455469d861b84aa910541262972a83b73d64c2efc57780eda2a311f24de2ba0
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.link/wix?keyword=brackets+free++for+windows+10`. This link is presented within the document body, disguised as a free software download. The PDF also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=brackets+free++for+windows+10
    • https://static.usrfiles.com/ugd/b148e5_f756b057ee6342479c5a40ade4d3c7f4.pdf
    • https://static.usrfiles.com/ugd/5e81b9_e59301ddc21f461f88c34fe12c4de0c0.pdf
    • https://static.usrfiles.com/ugd/4d400c_6d07a457f85c4062b964f2efe5a140bb.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/timabagomojiguvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/gonatifujorisifelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2544/8615/files/boy_meets_girl_joshua_harris_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/writing_task_1_vocabulary_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/38197771149.pdf
    • https://cdn.shopify.com/s/files/1/0437/6684/1505/files/34566401160.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/bozozekatudigodotexozin.pdf
    • https://cdn.shopify.com/s/files/1/0469/0234/5890/files/bizarre_love_triangle_new_order_vide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/sofasufowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/android_enable_auto_rotate_programmatically.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_off0000606d.bin
1c97f0c3db38906aa1077a23868d8e3405dfbbea566f1085cd060ec56dbe63b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 5384 bytes
font_01_sfnt_off000072e8.bin
8fdbc426dfb9374355fcbd70162e7de1cd2a5a6546a20a990c38508cca57e4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E8 9980 bytes

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