Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc748300338be10…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 21:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c3f0c66fa18cc6b4122189358bf6f1 SHA-1: 668fa2c846f67b9b76a3041f1f274c15baac509b SHA-256: 8cc748300338be106137a04404188714e9c1775fb8a00499bf8acd5cfec0f64b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector service. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=catlins+walks+pdf' which is likely used to redirect users to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content or to distribute malware.

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/pify?keyword=catlins+walks+pdf
    • http://files.scphimu.com/uploads/1/3/0/7/130776072/4838419.pdf
    • http://files.mmhcounselingservices.com/uploads/1/3/2/6/132681436/1683388.pdf
    • http://zuloma.bloombirthbg.com/uploads/1/3/0/9/130969723/namofokuvebomo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/fatufixerowibexezek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/wiwurukanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/tipevefofixosomuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2567/9015/files/sevazexisagoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/38553411361.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/wexomugakufuwonofufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/forojigilexusab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8790/files/atomic_structure_class_11_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/66785862989.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/jufezakofunepiwamoxojej.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/34053754617.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_off0000642c.bin
3644958def5df8c3f2919b7463d6f6b42c61e0fca39ad4cdc8f35296f049e81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 4680 bytes
font_01_sfnt_off00007433.bin
0d00f05e9f1563ef4b34dbeda260460651da7d74b90181f23d580e7a77acb675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7433 10364 bytes
font_02_sfnt_off000097b5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 4324 bytes

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