Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deaf61b5c96aa19…

MALICIOUS

PDF

47.0 KB Created: 2020-08-06 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb1075c9236e078ed4881ea173804fa SHA-1: 05e74ce1e1e8212eec9f4889cad0cdd838348437 SHA-256: 5deaf61b5c96aa193f8a53463d1544c486edf093e4e85994eb8af591f7b68c5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a classifier and contains a significant number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=ejercicios+de+altura+mediana+mediatriz+y+bisectriz+pdf', is identified as a known malicious redirector. The document body contains garbled text but also repeats the redirector URL and other PDF links, reinforcing the malicious intent.

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.cc/pify?keyword=ejercicios+de+altura+mediana+mediatriz+y+bisectriz+pdf
    • http://files.superiorwayoflife.com/uploads/1/3/0/9/130969179/lutawiluf.pdf
    • http://files.realmarketingclub.net/uploads/1/3/1/8/131856771/vaxekejeguzopeliki.pdf
    • http://files.churchhillproductions.com/uploads/1/3/0/7/130775304/8429107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/tapujanabibowumuwuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/zokidopufosadetita.pdf
    • https://cdn.shopify.com/s/files/1/0435/7832/7203/files/ordinary_annuity_sample_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/maxukofefedefutekotakek.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/angustia_definicion_en_psicologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/21577220690.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/1200_bosquejos_biblicos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/jitoladijizegup.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/oil_change_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/36166413478.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_off00005159.bin
f1e135e2e177a2a0d71908a922f5f88e9d38db164501011c85a206c0e1985152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5159 5508 bytes
font_01_sfnt_off00006407.bin
7688893ba8d29e2b6406c90e592112d6d00935cabb789266d44a31c57913263a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6407 11576 bytes
font_02_sfnt_off000089b0.bin
48f515d49a265d3cec15dbd2d5f47ba1c49b14e3908a9c859c3ba8f821ef457d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 16068 bytes
font_03_sfnt_off00009e50.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E50 4324 bytes

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