Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da35fdaa45a7e50…

MALICIOUS

PDF

34.9 KB Created: 2020-08-31 15:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6eb624053ecf14d4a24d40b6310a2af9 SHA-1: c90f241a1fc0c85a6766776636bb44fdcb8b707f SHA-256: 5da35fdaa45a7e506249e2ce1098edb8c75fc1b311f905367711ce6f9b05d9d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to benign Shopify URLs, but one critical link redirects to a known malicious domain. The document body text and embedded URLs suggest a lure to disguise the malicious redirector as a search result. The ML classifier strongly indicates maliciousness.

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.me/wix?keyword=time+expressions+exercises+pdf+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/telugu_calendar_2020_august.pdf
    • https://cdn.shopify.com/s/files/1/0437/9960/9505/files/77477154871.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/sixixorezoxidozesatikogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/cars_3_ps4_trophy_guide.pdf
    • https://static.usrfiles.com/ugd/db1da1_e2373f44845546159ed495d0ea266b8c.pdf
    • https://static.usrfiles.com/ugd/2b25e8_f7f26311061346929905de6b40f50f6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5dd5b56f6ec452c817aecb991107b83.pdf
    • https://static.usrfiles.com/ugd/2e79a6_edeb4fe67ef346438b53960d5c1f073f.pdf
    • https://static.usrfiles.com/ugd/565485_e2ef5565106a4fd4ad021affc677fe83.pdf
    • https://static.usrfiles.com/ugd/b8c837_3635a1af29d649b2bb88033299c6ccbd.pdf
    • https://static.usrfiles.com/ugd/895bef_b1601ddb9be243378546e02cf206774c.pdf
    • https://static.usrfiles.com/ugd/2813e2_27f2aeeb3914451f9d2dad42eb62b9c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_669cf7f73d7d47788a173a295d4e4d50.pdf
    • https://static.usrfiles.com/ugd/576447_6fd8652b0db3432890f530da714e7260.pdf
    • https://static.usrfiles.com/ugd/eaf48f_ebbf10ce69584b7b98cab548997a00f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bc19c4b22e94fb09da987312d9a7df4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f9e3cc8fca1437bb4a68dfac41caea2.pdf
    • https://static.usrfiles.com/ugd/4b874d_cddd4fec8b0c409ab82245e53e6da413.pdf
    • https://static.usrfiles.com/ugd/b8c837_59de6ac12912479a83686689179d656e.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_off00004aee.bin
909c22350fca564c609f3faeec334e85230bfc5ff67ae957c1343b55d8e257c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEE 5472 bytes
font_01_sfnt_off00005d6e.bin
b13b46a60e0da1844240c5d522690b21887b65355559fffcfbba2c83eae1f038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 9632 bytes

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