Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7f0183c4d7e48f…

MALICIOUS

PDF

48.7 KB Created: 2020-08-07 06:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b525b28ead394d1d5726858729200635 SHA-1: 5be495440459387d92262e8696ce4589214641fe SHA-256: 0f7f0183c4d7e48f9dd44379ed55ef0fb49aaf374a48341b5e850782f3c10618
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate PDF files but redirect to a known malicious URL. This technique is commonly used to drive traffic to phishing sites or to host further malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=lung+abscess+guideline+pdf
    • http://files.ecoessex.com/uploads/1/3/0/7/130776720/9598725.pdf
    • http://files.arcadianvacationrentals.com/uploads/1/3/1/6/131606745/wineduloga.pdf
    • http://files.lazycf.net/uploads/1/3/2/6/132681342/tupibojep.pdf
    • http://files.edgecombebrothers.com.au/uploads/1/3/0/8/130874129/gevewi_misivu_muxadapolifej_wigom.pdf
    • http://files.wavehypnosis.com.au/uploads/1/3/1/3/131384636/zezof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/kolatexazabukubidales.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/jigenu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/physical_science_grade_12_quanta.pdf
    • https://cdn.shopify.com/s/files/1/0447/9208/6685/files/firewall_security_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/13357167142.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/zokenudisil.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/candy_juntar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/the_official_guide_for_gmat_review.pdf
    • https://cdn.shopify.com/s/files/1/0435/6197/5971/files/aiou_admission_form_spring_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/gavojof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/zodewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/runobavufulaxan.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/consecuencias_de_los_malos_habitos_alimenticios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad0.bin
743519f13f4ff1fa0bd4197e1720aa7b5ef0cc8bea23f63e9b8ebcfd65e55d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 5308 bytes
font_01_sfnt_off00007cf7.bin
2e1c2e94aa20442b97fc9fd0c2de14b5340a7b1dd3896caaf9fb945c05069d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 10292 bytes
font_02_sfnt_off0000a057.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA057 16204 bytes

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