Malicious PDF — malware analysis report

Static analysis result for SHA-256 058466dbe80dc4f9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-13 23:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf76427d30006c1f541a0903cda8b64c SHA-1: c52a6272ef2c48c9a9ab20ce37b09dac458af85c SHA-256: 058466dbe80dc4f9daf1ee8030076119fc5d978733ae0b59512c16db14784d02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes text related to educational worksheets, likely a lure to disguise the malicious intent. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=addition+and+subtraction+worksheets+first+grade
    • http://gatuvepe.sockfetishsocks.com/uploads/1/3/0/7/130775735/kadagele-somiruvalakuj-xaxabukumudugu.pdf
    • http://files.bestpebble.com/uploads/1/3/0/8/130813992/sedepuj.pdf
    • http://files.daliahaas.com/uploads/1/3/1/6/131606502/wuxodolefa-mumavav-fuxulejunurebus.pdf
    • http://files.hither.com.au/uploads/1/3/1/4/131438127/junuje-kitovovujomezu-pukabugad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/47791165212.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/gurozadibit.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/xorigupadokivilov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/buerger_disease_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/lelosegifuwaxobukiwone.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/trx_force_training_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/because_because_of_due_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/vim_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5264/files/sugajerifukidoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/76139668640.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/future_dirty_sprite_2_zippyshare.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/metefegelis.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000647f.bin
2b23c06778bb1f73f26c41af5f2c3b96de59a25534b703a5e20aebcf1c59dd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5536 bytes
font_01_sfnt_off0000775d.bin
d895237c00b77319e0f69975d7ca6793aecfc9ef598773d035335aa6de528773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775D 10132 bytes

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