Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed9a7867e3e8536…

MALICIOUS

PDF

58.0 KB Created: 2020-08-30 14:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e454d9ddb3f711b6e7897347d68ea7e2 SHA-1: 8d54a52b4f30db2a60b74a683bc7a70d241bd377 SHA-256: 4ed9a7867e3e8536ad574f00a65229ffa166e89dfa453c19e535ae3d1d1e740f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=new+hindi+songs+download', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to trick the user into visiting this malicious link. The PDF also hosts a large number of other links, likely part of a link farm to improve SEO for malicious content.

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=new+hindi+songs+download
    • https://static.usrfiles.com/ugd/d5cf39_01966e3ede5e4168918a00c05b7093ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb5827ff099f4b069bf1397fac961bc2.pdf
    • https://static.usrfiles.com/ugd/c12414_74fde22392a6475fb1b2c9d1113e5c46.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ee1c28aca8949a5a4f2c35802287cec.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_394caede95364ef7927c8d34f8647581.pdf
    • https://static.usrfiles.com/ugd/4d400c_e3f1c5c2bfe344bcadeffae900a30e0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3ef07e97904202a80aa852f99cc785.pdf
    • https://static.usrfiles.com/ugd/f1780b_371f1aef8d1b4597918f24f6a5f16214.pdf
    • https://static.usrfiles.com/ugd/a86d68_3558ed45015a4cea9a50e91b5a54b1a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7746f27624a447689928a2356cdaa579.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2703d6f23054d5e99f2ec4970135d8d.pdf
    • https://static.usrfiles.com/ugd/b910ae_b60afcd4e78049b0817e903b3953580e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/tebukifur.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/nags_head_weather.pdf
    • https://cdn.shopify.com/s/files/1/0462/9014/1344/files/15306967834.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/37182313593.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_off00007b18.bin
0af4171021af6172f6c239046286fa150220324fac28face2f6b41088c15eb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B18 4760 bytes
font_01_sfnt_off00008b48.bin
cd1f6cf8c85e59aa57711932690b255c7b1a6790958d18d662cf2532754e384e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B48 13960 bytes
font_02_sfnt_off0000b7cc.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 16204 bytes
font_03_sfnt_off0000ccfb.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 4324 bytes

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