Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cadc9d3edcf352…

MALICIOUS

PDF

48.7 KB Created: 2020-08-30 08:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bbb5bb999f8a2cb88a6dac399dbb8a0 SHA-1: 5544ab2903f81041136e932a01a3bfb1c93d8ff1 SHA-256: 63cadc9d3edcf35209b4f64141e162042d91f6c5d9c5f36c7249dc068e188ba5
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of an SEO link farm, with numerous external PDF links. While no scripts were extracted, the presence of malicious redirector links suggests an attempt to lure users to harmful content, potentially as part of a phishing campaign.

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.com/wix?keyword=the+buddha+of+suburbia+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_21b9ebe27ef7402f87e0d0f199e9f391.pdf
    • https://static.usrfiles.com/ugd/b7ed05_56aa2be95cc942418fdd59a1f42788a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fdf14fbccdf47169eb3b1d1f1c95a63.pdf
    • https://static.usrfiles.com/ugd/1f5cef_ca8c5b1f63cb42aa8923c3d8226c3513.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99397771733.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/43601721949.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/gofasejikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/sevogumuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/92696397139.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430d59fc6b84d73877ca041e394734c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a0b6046ad114dd39fdaab408f25ea4d.pdf
    • https://static.usrfiles.com/ugd/aef5b7_865bce5f35f34865b0948562747c73e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_67869d0b1a424653b7b6877be0e9f2df.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d86b7417ca4d8ea362872ef1700ea5.pdf
    • https://static.usrfiles.com/ugd/158fb9_7f143c3dfaeb472994b0b8691e4d9601.pdf
    • https://static.usrfiles.com/ugd/b8c837_12dbbae6700946b2bd35f5b8641ff41c.pdf
    • https://static.usrfiles.com/ugd/b8c837_39f7dbe0cd854a7083df6d2543a5a8f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/225520_c8fc947dc6f54007969cd4d5e946a7fa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b7.bin
dce4e169075c8f99ddb10072952754fef05013acd36ed7c6295bd82f3b3f9623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B7 4880 bytes
font_01_sfnt_off00008352.bin
bfe836b7ec3b05e3c2138083717735d434e6128a700f94adfc7b7dba5b0fec97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8352 10584 bytes
font_02_sfnt_off0000a731.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA731 4324 bytes

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