Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85e20830722bf2d…

MALICIOUS

PDF

49.7 KB Created: 2020-08-18 20:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22491b5e3bec0847f4479b1a4cba2035 SHA-1: ae1099a246929ea7128e591b4d553bb21ca5192a SHA-256: e85e20830722bf2d63746aed0f3b811809fcabad5f3ce5821b0c7b317d7c014f
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to a redirector service. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=agora+images+hd', which is also listed as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=agora+images+hd
    • http://serufe.valerieaxtcpa.com/uploads/1/3/2/3/132303117/3684770.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0856/files/44306088679.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/39354937530.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/zugododidisalevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/17432031987.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/23533311478.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/unir_archivos_en_linea_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/72608604185.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/amilum_jurnal.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/64504911972.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000757a.bin
4ca791178284314c12109de39a3f6c390ab9885cf5c751f271eac559db000333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 4796 bytes
font_01_sfnt_off000085b8.bin
a3c6c6d71d4179c916b12c3d9fa442e2dd5d7a4e1c407196a4e6e32e8ebdc0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B8 11932 bytes
font_02_sfnt_off0000ac86.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC86 4324 bytes

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