Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c2490d2dd4a827…

MALICIOUS

PDF

51.5 KB Created: 2020-08-18 19:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56d9af96e151d97c60316a000ed7d720 SHA-1: d118060b17fd10f065d0b884dcdd72f85d2fedef SHA-256: 67c2490d2dd4a8271b7c5f85520016dc3ded6e30881068e4a4dcd1d9b1cd0ab0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm and a malicious redirector URL, indicating an attempt to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, including one pointing to known malicious infrastructure, suggests a phishing or scam attempt disguised as an 'answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gate+xe+2016+answer+key
    • http://files.gobarespaonline.com/uploads/1/3/1/4/131453247/vepewesigojutav.pdf
    • http://files.chunkyharmonies.com/uploads/1/3/2/7/132740172/4bf31.pdf
    • http://files.antiquefairscornwall.co.uk/uploads/1/3/2/6/132682303/5383172.pdf
    • http://files.playtherapyworks.com/uploads/1/3/0/7/130775503/xogixo.pdf
    • http://files.oibaws.org/uploads/1/3/2/6/132682171/felopubap-mexor-jokapezupaj-zovemesituzifu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0664/7707/files/mixed_tenses_exercises_present_past_future.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/5682213403.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/jilerasuzawisukosonazunip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/netufudiwuxirusavewerazan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/liralu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/nebibelinogubub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3482/7162/files/eragon_book_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/nafasofale.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/aprenda_a_desenhar_pessoas_guia_completo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/gobuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/cape_cod_times_traffic_report.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_off0000672b.bin
ca68e4b8c751f0afc5a8bc70f8bd94ba556dd1dd894e26ed739a4149e6e21e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 5484 bytes
font_01_sfnt_off00007a03.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A03 2320 bytes
font_02_sfnt_off00008456.bin
2fb046786815360951fd89ceaf14390aa79330ec41dc13f845f324c569c626e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 11860 bytes
font_03_sfnt_off0000aab6.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB6 16224 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.