Malicious PDF — malware analysis report

Static analysis result for SHA-256 754bec44f5e4dc9d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 18:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afc075051385252f6488e36ee49f88c SHA-1: b739249306bda8d092acf92d4268685641526461 SHA-256: 754bec44f5e4dc9ded85eff2009909276f3a0628f39d6e8848e14bd5833a062b
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.com/wix?keyword=free+printable+bookmarks+to+color+for+christmas'. This technique is often used to obscure the final malicious destination and evade detection. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly indicate a malicious redirector pattern, likely intended to deliver a secondary payload or phish for credentials.

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=free+printable+bookmarks+to+color+for+christmas
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/7460708288.pdf
    • https://cdn.shopify.com/s/files/1/0440/3780/0086/files/12196284764.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/46251525601.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/39378143474.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/ansys_workbench_tutorial_guide.pdf
    • https://static.usrfiles.com/ugd/345929_c7e57f55d37e44819799750b930c3f02.pdf
    • https://static.usrfiles.com/ugd/b8c837_e340b4e0341b4c08a2f918c0e687e228.pdf
    • https://static.usrfiles.com/ugd/4dd980_27129a87fcd54347b0aae30ed2263763.pdf
    • https://static.usrfiles.com/ugd/87a178_c00dadf424344c64aa5f093894a7615c.pdf
    • https://static.usrfiles.com/ugd/97493d_e58db4dc56904de59fc5d195352f035e.pdf
    • https://cdn.shopify.com/s/files/1/0428/5523/5740/files/precalculus_larson_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0466/7808/1701/files/coliform_test_for_water_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/xebixawimiwelulolegezazij.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/minecraft_se_binary_not_responding.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_off0000659b.bin
cc42f4b82f97bf74ed690b9d006b21819e126f3e35e20f53981968693a4105d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 5412 bytes
font_01_sfnt_off000077d2.bin
0539dcac6436692f5a6b8371f3d6594a36fc00493188ba47cc373ec9161e665e
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 10060 bytes