Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcf4e092c428c72…

MALICIOUS

PDF

61.4 KB Created: 2020-08-29 09:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a6f697e2e3f431302dc2ee48574ab7 SHA-1: 71c10551d7524d1a3e8c6004163407d58d238f57 SHA-256: 0dcf4e092c428c723a0c655e6ff5eeecaa04d3b1c792665e27d4670c46345147
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of the primary links directs to a known malicious redirector, indicating a probable phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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=tracer+voice+lines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/el_alquimista_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/8729/8714/files/airtable_create_forms.pdf
    • https://cdn.shopify.com/s/files/1/0464/6191/1208/files/sojidizekejakebakojumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/linazadawerepubepu.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cf55a1e12b049beaef37598af8b68c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb3c54016d04d24ab1ab29580d5a40b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b03471109f874eecbcb614e3141d72b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e24c6fa2c754dc99b2900516f28e6c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4b32c57ab241428c5361669087035c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/encyclopaedia_universalis.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/accident_reporting_centre_ntuc.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/37756283752.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/xerojepuwum.pdf
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/wilcom_2006_sp4.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009216.bin
f9f4e1514ecc5feafe0ca672d8d1691b0f19b28f52e048ecd054f433c8e100eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9216 4508 bytes
font_01_sfnt_off0000a15e.bin
d5095e6a76d56cb9d373ed69a89fde3c9db54fe9cd1eea1014362b9f54be6e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA15E 10696 bytes
font_02_sfnt_off0000c5a9.bin
1398bbf2dfd9cae4409d1d8ab67a79f495e147aa07cce54436be1c2862721d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 16064 bytes
font_03_sfnt_off0000da4c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 4324 bytes

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