Malicious PDF — malware analysis report

Static analysis result for SHA-256 d426f1e2d5c20970…

MALICIOUS

PDF

52.9 KB Created: 2020-08-30 22:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33639fc27e87532d6dffeb7c98ed30f2 SHA-1: 355a7776b799d5dbc31db1965a2888ee5d7c328b SHA-256: d426f1e2d5c20970a36cf6d48857dfa681c5a2d1f6457afbd38951d34679a14b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a summary of 'Thinking Fast and Slow'. This redirector likely leads to further malicious content or malware. The PDF also contains a large number of links to external PDFs hosted on shopify.com, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. 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/wix?keyword=thinking+fast+and+slow+summary+pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/fozuxonubof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/argala_stotram_lyrics_in_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/63047206870.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/printable_bingo_sheets_1-_75.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7596/files/paypal_credit_card_information_stolen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8362/files/tenub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3456/5025/files/per_chiedere_informazioni_in_francese.pdf
    • https://cdn.shopify.com/s/files/1/0459/5443/3183/files/96403878139.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3bcece0ea7d4d40863468a3da084ff0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8e4ae36c5374a73b9f1ceb5e9ffd61c.pdf
    • https://static.usrfiles.com/ugd/b8c837_956b4bcb422545049caddb2fe0b7163f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3873bd5d94985827907ad64daa3e0.pdf
    • https://static.usrfiles.com/ugd/c068f8_4a838927c62e43edbc0a9c78e872382d.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_7c02d8fc921b44e18fad7cc9af04febe.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fe961d527c40e48348b34a240f6a04.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddc0d5fcb8a44494abef368e060e3a4e.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_off00008e68.bin
4f89ecca9b22890a2cda463e6b42b6c3ebe68f0e7359bf55a52d40cfd4f4ec7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E68 5660 bytes
font_01_sfnt_off0000a195.bin
92e0ad18cb4fc1669ebab4027cc64cc9c7cfb5ae57f5ba2d82caa67529f2c8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA195 10800 bytes