Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f61a70616b4ffb…

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 05:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876bf8aaa204cdddaf9329520aff75ad SHA-1: 1cab46ecfe1398bb249202f294eb065cd129856a SHA-256: 62f61a70616b4ffb652473b2008dfeb4039e7e3d7564ae7cf0117d77f258b1fb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lure users into clicking on it. The document body, though heavily obfuscated, contains text related to a missing DLL error, likely intended to trick the user into visiting the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=msvcp140.+dll+is+missing+windows+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5251/4971/files/78578920180.pdf
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/wibojeguxewokixonoxakoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/95712608351.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/jederakagoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/33173387963.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/cbr_test_practical.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/medical_certificate_rajasthan.pdf
    • https://static.usrfiles.com/ugd/ca32a8_5175b8fcec894f49889a6492b866fe1a.pdf
    • https://static.usrfiles.com/ugd/76156b_1a9dad4f87304fb29a4289c1f78510ac.pdf
    • https://static.usrfiles.com/ugd/565485_34ae4ad04460475ab6a7654ae8dab002.pdf
    • https://static.usrfiles.com/ugd/89064d_5ff15e4ba0874a58ab603191b7ce9fd8.pdf
    • https://static.usrfiles.com/ugd/912de2_8495b1002846430f99ea5409cf7fe933.pdf
    • https://static.usrfiles.com/ugd/008e52_88599d17f3b34e5da5dc3434d7da98e6.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_off000059d7.bin
e7b7a0ee9b2731ff453ec8272e52e613f01bb38968a06ef00fdd74fa8ad64648
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D7 5556 bytes
font_01_sfnt_off00006ce7.bin
8a5a9491763ca65d69eaf82793ef103d04ce802cad04554c0ee85d534219697d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 9912 bytes