Malicious PDF — malware analysis report

Static analysis result for SHA-256 620197ae1ffd0c93…

MALICIOUS

PDF

54.0 KB Created: 2020-08-16 21:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4734f5f7f535e1bfdcb70a725f7c0423 SHA-1: 7c4d21d4296b9036c4bb2cee6a9acc80a836204d SHA-256: 620197ae1ffd0c937b521b0469bc8637888efb6367459ea79211cb5778855fa3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document also includes a large number of links to external PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. 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.cc/pify?keyword=soundhound+app+free
    • http://files.foxoildrilling.com/uploads/1/3/2/7/132740291/6966785.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5747/0870/files/implementing_safety_management_systems_in_aviation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/88675569999.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/80284728157.pdf
    • https://cdn.shopify.com/s/files/1/0432/7725/4814/files/66198307586.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/social_psychology_aronson_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/lopekokola.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/niwoxipo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/59306004997.pdf
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/xegiziwirijunagomejolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/befovapegamebawisibuxux.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/42425594746.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/serativozulizukobivop.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_off00007a23.bin
812b9fae418c2243ab20d432f9323568b70f9d13579bcfec0ff98ed4168ddaac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 5024 bytes
font_01_sfnt_off00008b2d.bin
e892a3baac93425937e183f4fd4ee760835f7354a997d6409d7a6cd626c9e2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2D 13260 bytes
font_02_sfnt_off0000b5da.bin
22fb568feb197e6acf9200b23e73596f8f15260301962c37d3b57e6b3300ba63
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 16268 bytes