PDF malware analysis — malicious · 880ca78dbf30ea28

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 06:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dd6b360019874138edeb7e312c3d5a19 SHA-1: df352baf93c671068553858f2bd1d886196b2243 SHA-256: 880ca78dbf30ea28de26bfd843602a30e5320fd85157ad982df80edf6bc26121

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though partially corrupted, includes the same malicious URL and appears to be a lure disguised as a worksheet. 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.ru/wix?keyword=spanish+clothing+vocabulary+worksheet+pdf
- https://cdn.shopify.com/s/files/1/0436/9275/3049/files/minecraft_game_free_pc_full_version.pdf
- https://cdn.shopify.com/s/files/1/0434/4096/3751/files/athlean_x_ax1_program.pdf
- https://cdn.shopify.com/s/files/1/0434/2956/0486/files/does_costco_convert_slides_to_digital.pdf
- https://cdn.shopify.com/s/files/1/0437/8948/4190/files/vunarujozejeja.pdf
- https://cdn.shopify.com/s/files/1/0431/2439/2087/files/xigumabarevovunetevifiga.pdf
- https://cdn.shopify.com/s/files/1/0427/8163/8812/files/20158297682.pdf
- https://cdn.shopify.com/s/files/1/0437/1464/2070/files/29744232043.pdf
- https://static.usrfiles.com/ugd/09c3c7_aaf0c862c17f4784a018ae4c4caaaad7.pdf
- https://static.usrfiles.com/ugd/a474dd_be27f89f981440dab616aa938d203a35.pdf
- https://static.usrfiles.com/ugd/2ca09c_22a351ca08064739a7896f237788c607.pdf
- https://static.usrfiles.com/ugd/eda9ba_84733db48cfa41e0b463aabae600b851.pdf
- https://static.usrfiles.com/ugd/b8c837_f99bd3d67a4b4b1f82edcba6edde4e40.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005677.bin` `a9a0b2c069b5ad73b1a416b0b0fa33c41fca5eca4d3c8f8711d81cd7cf85b4f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5677	5976 bytes
`font_01_sfnt_off00006ade.bin` `c90c5d72f00705182da46606b0b1a4cfaa494c4edf184f90caefab3d1bcadbd7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ADE	10024 bytes

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