Malicious PDF — malware analysis report

Static analysis result for SHA-256 0475fcf2b60b170d…

MALICIOUS

PDF

57.2 KB Created: 2020-08-04 08:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561cd9632c9069bd56ad0867c35487df SHA-1: 4a09ba95e6e943697cb90d51258c4ed81130bddb SHA-256: 0475fcf2b60b170d4d16c3a0771bde5984700448d62b54eb82224d14f7425906
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=bobina+de+tesla+pdf+unam
    • http://files.thurstoncountyrw.org/uploads/1/3/0/7/130775647/30e2441e722b.pdf
    • http://files.goodandgraciousco.com/uploads/1/3/1/8/131857304/1148707.pdf
    • http://files.horrortourers.com/uploads/1/3/1/6/131606056/d5036.pdf
    • http://files.cpasgc.com/uploads/1/3/1/4/131438758/8467879.pdf
    • http://vanidud.zombodroid.com/uploads/1/3/0/8/130874522/gulijopojib-fogagaxekogago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7323/1258/files/18614228703.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/32330359679.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/99980705900.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/7505255776.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/luwok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6918/4931/files/mupenukamaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/semuvopufonaban.pdf
    • https://cdn.shopify.com/s/files/1/0441/1860/5976/files/mesodewemefatoxafem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73633131036.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/justin_beiber_sorry_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/8394428704.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_off00008945.bin
41a8d705fb49bdf2ebe157a54a917e884245ec3f60ecfebb814d9e6a252e0e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8945 5280 bytes
font_01_sfnt_off00009b28.bin
e380070bfe3b37a9111efd84766b4a389f063516e9ba5a8c5ad4325a237e8613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B28 11604 bytes
font_02_sfnt_off0000c0f2.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 16204 bytes

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