Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64cd25b21ae57f6…

MALICIOUS

PDF

47.6 KB Created: 2020-09-06 16:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ffbcad11f1f2a0e8e9d9b5024ca3ad SHA-1: c885e935fb9eaaa2d22e379c889b02bfcb986022 SHA-256: f64cd25b21ae57f69988c2e7db683692b483cb76eab26a1d930688df2fa94461
154 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as search results for 'cricket games for android 2019'. This link, ttraff.me, is known for redirecting to malicious content. The file also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to static.usrfiles.com, likely for SEO manipulation or to host further malicious content. 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.me/wix?keyword=best+cricket+games+for+android+2019
    • https://static.usrfiles.com/ugd/19103d_93e1a3b1874b4165bc79b86268a54f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_eca20d8d80864686b7b0ff98c33d8a2f.pdf
    • https://static.usrfiles.com/ugd/8e66a5_ebfd77ac157146bebeed249d23328f59.pdf
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/6dcf04_b9aa750c03504d1890779431c6a805c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fdb069ff4f04dcbb37ab1446f3308e2.pdf
    • https://static.usrfiles.com/ugd/34ec99_66f48b3409a84da9be376b8596b9c9d5.pdf
    • https://static.usrfiles.com/ugd/9904c2_82c0883b797f4fce9f35daf4962f51b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
    • https://static.usrfiles.com/ugd/33a16d_652eaa0479d74179a093cc79ccc5b34b.pdf
    • https://static.usrfiles.com/ugd/f459ea_daacc5c38bf842f49f21dfffa9b906ea.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/foundations_of_analog_and_digital_electronic_circuits_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/5493/9542/files/mojanexilesefugepeturefiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/2014_dodge_charger_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/98306794104.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650d.bin
2f4983a0b16ee3eca3a26a484ff2bc3cfa35f5b8ab15725192de5feeb9542e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 5904 bytes
font_01_sfnt_off0000791d.bin
7df80b9523068514bc37333cce85c80818eee987aa47b313598893bfb10747f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 10224 bytes
font_02_sfnt_off00009bf4.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF4 16164 bytes

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