Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bf54ef5558d7d7…

MALICIOUS

PDF

34.0 KB Created: 2020-09-08 18:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f786ddf147b2cf481ad5b1da82c1b42 SHA-1: 803dab52717b250fc3bd6ad30820fcaf26ebf254 SHA-256: 96bf54ef5558d7d798c5cb8c22d3f2de56f79d9e8f39b89b3346c1360517f68e
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.me, which is disguised with a search query for 'ayub bachchu video song'. This suggests a social engineering tactic to entice clicks. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, indicating a link farm or redirection strategy. 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=ayub+bachchu+video+song
    • https://static.usrfiles.com/ugd/3ab5ed_2fdad29bdbc8464caccb4288433b91ae.pdf
    • https://static.usrfiles.com/ugd/97493d_7e489190f4d1404c9cfffb312ac9cba1.pdf
    • https://static.usrfiles.com/ugd/3fc21f_f56d10b4355249369e6601b83f02c463.pdf
    • https://static.usrfiles.com/ugd/7ff653_3529022f1f9a49eda0aceb40f387893a.pdf
    • https://static.usrfiles.com/ugd/575fb0_9244dea7071c4394ac4a3b13b51e1e68.pdf
    • https://static.usrfiles.com/ugd/1decf9_546f9f660bf744c08dd21d72066423ea.pdf
    • https://static.usrfiles.com/ugd/b5aed9_c67fa29c57a54f3eb1aee461b39c6c78.pdf
    • https://static.usrfiles.com/ugd/cafc24_2dc6071c18e74606835a72cb589c1b0f.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/filawotosozukoli.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/wapijotilinabo.pdf
    • https://cdn.shopify.com/s/files/1/0472/2599/5429/files/zenuzoba.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/99441124957.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/danumuzixadarix.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/31610308570.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/communication_style_quiz_assertive_passive_aggressive.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/dotalorafemobowodubuke.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_off0000477e.bin
84b388189076aa3a9b0f75c1b8ac8e6efc47e7a1a255a150c2c847ca84a26a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x477E 5364 bytes
font_01_sfnt_off000059cc.bin
4d92a96b22e061dc7dc161742825439175d3f5fbbba4cc5dfc443548f686c218
pdf-font-stream PDF embedded font (sfnt) at offset 0x59CC 10164 bytes