Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fe091b8fd0b5b5…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 08:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e66b78a6ed08cb5708f0617a0dfa5684 SHA-1: 29ec722e8c6cb84886dba496de5710666fe0741f SHA-256: 59fe091b8fd0b5b543031dea6ac57936d4ce13093d7dc47ff593cbff51a883e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as 'Report card comments for kindergarten science'. This link, 'https://ttraff.cc/pify?keyword=report+card+comments+for+kindergarten+science', is designed to lure users into clicking it. The PDF also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier 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.cc/pify?keyword=report+card+comments+for+kindergarten+science
    • http://fusogive.escapelandscaping.net/uploads/1/3/1/4/131482995/furavolamibone_ropunute.pdf
    • http://files.lesanelesesneunited.com/uploads/1/3/1/4/131453401/sowiseju-javijibufo.pdf
    • http://files.pebbleptso.org/uploads/1/3/0/7/130738918/wefiroxilejipo-tagakapolunugub-xabid.pdf
    • http://bolureba.cybercats5436.com/uploads/1/3/0/9/130969368/7124231.pdf
    • http://files.beaverutv.ca/uploads/1/3/0/8/130874067/47bc87fc2beaee.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/wifonogaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/40609646756.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/60773932262.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/82149116276.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/28510028267.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/zipukixoful.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/budget_constraint.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/gedaxeranuwu.pdf
    • https://cdn.shopify.com/s/files/1/0457/5831/6700/files/rifibisoweruxixivusenawav.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/jeep_cherokee_1999_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/36952353696.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064cf.bin
1ca7435df52bad4d9d25af5387b8ff1184881a885e6ac85287888587514b47f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CF 5516 bytes
font_01_sfnt_off00007785.bin
bcbb7e0bdc8cc1f539130b3ef4fc60d3700a82a0e518e94ec196b6389ca26b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7785 9876 bytes

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