Malicious PDF — malware analysis report

Static analysis result for SHA-256 608ada068d70e1e5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-25 14:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14dd4b3fbb5cb7b3b9d3689b91072bd SHA-1: 7882d69063fcf7e35b5e9a9b340d70a56bf752a3 SHA-256: 608ada068d70e1e5338de7f38940e46eb13792789fc5d863580d9175bfb5c1e6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms designed to manipulate search engine results. One prominent URL, https://ttraff.ru/pify?keyword=auditoria+interna+pdf+livro, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking Shopify URLs, suggesting a tactic to disguise malicious intent. 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.ru/pify?keyword=auditoria+interna+pdf+livro
    • http://files.atthehelmbluffton.com/uploads/1/3/1/4/131438570/e1ad45c013.pdf
    • http://dowerudo.uboatphotos.net/uploads/1/3/2/7/132712615/0b61bab8e963e2.pdf
    • http://files.hometeamadvantagerealtor.com/uploads/1/3/1/8/131856907/5ac5d53d7da09.pdf
    • http://files.oyezbookskids.com/uploads/1/3/2/6/132682124/47643.pdf
    • http://files.keppelcoastcameraclub.com/uploads/1/3/2/6/132681536/kuzili.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/23055067414.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3883/files/bowafakemumozimikepufad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0460/8625/8852/files/claymore_anime_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/breast_cancer_staging_tnm.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/zilitudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/pdf_carburateur_solex_32_34_z2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/mefutegofimipiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/woxaguv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006134.bin
0e83662f1c687de41f328264add566c70b480f90951aa1f0c22760189d4cbb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6134 4904 bytes
font_01_sfnt_off000071f6.bin
e6b65dedf19235fb47531360958fde54e484d217be969087ccf907bc86a5c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 10204 bytes

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