Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e25579e73f4448…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 08:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abb3d087d52ad7d720b7ecad59ca31b SHA-1: a408cdd05f5b95ebf1ec9e06202cbb30453743bb SHA-256: 98e25579e73f4448737c40dd9517f00f983aac862a34fbf040cc342468a2b48e
152 Risk Score

Malware Insights

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

The PDF contains a link that impersonates Adobe Reader, directing users to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure includes a mass external link farm, suggesting a phishing or malware distribution attempt. The primary IOC is the malicious redirector URL.

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=adobe+reader+windows+xp+32+bit+sp2
    • https://static.usrfiles.com/ugd/2e4eb4_5be10f665e084b0d9fefa72567d8f147.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f523f56af1f483e92e1b8739e9867df.pdf
    • https://static.usrfiles.com/ugd/7198c1_4de2e0bb742b4dc78ac20536a63ef6ff.pdf
    • https://static.usrfiles.com/ugd/912de2_7330fbcaadc44b45a8a680bfccb0e929.pdf
    • https://static.usrfiles.com/ugd/b8c837_7642f6ffc28645288c5cd434533edc10.pdf
    • https://static.usrfiles.com/ugd/b8c837_7902245d2bbc41298be85ada6cb43531.pdf
    • https://static.usrfiles.com/ugd/b8c837_70c3ed30593944dfab658a37850a33e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ff512707e844248063155b12a8eefa.pdf
    • https://static.usrfiles.com/ugd/739437_9a7590c1122248198ca8e20512aaf49e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/23009995847.pdf
    • https://cdn.shopify.com/s/files/1/0434/9018/1286/files/rarizojafegubetetuliji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/miruxedejufosukevovevina.pdf
    • https://cdn.shopify.com/s/files/1/0440/1725/4558/files/nudepotararoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/sap_bods_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/cross_eyed_emoticons.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff3.bin
775c7beaf6d87dd06e48b20e1e876029dd932c199160b4a71dcb182b5f05d767
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 5508 bytes
font_01_sfnt_off000072c4.bin
2f059306d6f08009f341a496811b059251862f6c76f893459f68753da4a10cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 10380 bytes