Malicious PDF — malware analysis report

Static analysis result for SHA-256 c848e72affd1673d…

MALICIOUS

PDF

62.9 KB Created: 2020-08-30 20:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313dc90e18ed8294c6a9883056666a80 SHA-1: a114162fb88f523a20b2c0fa03258bfa80cc0fc1 SHA-256: c848e72affd1673dd606d0dec0ef54f9d535121e46e50621b29895d7f0db6de0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring users into clicking these links, which likely lead to malicious sites for phishing or malware delivery. No scripts were extracted, and the document body was unreadable.

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.com/wix?keyword=lavof+streaming+vf
    • https://static.usrfiles.com/ugd/10a4aa_1a7b991677ea4d26a90b952b809f26a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb538a5856ec400bbad7fdf3f6db4f36.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ebabf572332487ba4a4f7712ca3cfcc.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/21265103167.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/55721588159.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/apprentice_electrician_job_description.pdf
    • https://static.usrfiles.com/ugd/44b221_941c898e4c7b4721893bdc935bd00bb5.pdf
    • https://static.usrfiles.com/ugd/158fb9_5ccab4588df34f84b8522e8488285de6.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_4e5023834be8412f80444abb7bc9676c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6af7c90fc7c6482182a8da4ad1b15588.pdf
    • https://static.usrfiles.com/ugd/b8c837_f26783c5898343659938d719a5737507.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af2958918294897a28c4037d4c9908c.pdf
    • https://static.usrfiles.com/ugd/b8c837_396629ec99d94ffd808ba9b983161948.pdf
    • https://static.usrfiles.com/ugd/69695d_3e55042f209b401799c2ec91f19d0b54.pdf
    • https://static.usrfiles.com/ugd/eed56f_eb149299366f4375bf561b971edc04b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.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_off00008f37.bin
7598dd93bc1d3c7b340735daf0825ab57c44efc5ed9b669944e83d6938d0c8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F37 8188 bytes
font_01_sfnt_off0000aaa5.bin
50d0b6df9d5711790354d3335a9d2ba2079bcad0ced1a301c901ea6b7be122c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA5 4844 bytes
font_02_sfnt_off0000bb06.bin
22929bdcb33bbf1fde2cd1985a5b0a6ac5fa53005962a246346f0655828c1cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB06 11180 bytes
font_03_sfnt_off0000e082.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 4324 bytes

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