Malicious PDF — malware analysis report

Static analysis result for SHA-256 4762efcbb9f3448f…

MALICIOUS

PDF

50.2 KB Created: 2020-09-13 07:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d926995dc7faf9389d21d6dd1c1f38 SHA-1: 778d4262bd51f7aed919a0c8a0c41423abec79eb SHA-256: 4762efcbb9f3448ff70e097117c6ac0f89c51fd88f2f11ea3375928d0eebe396
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains the text "Google best love quotes" and the malicious URL, suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates an attempt to distribute further malicious content or engage in SEO abuse.

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=google+best+love+quotes
    • http://files.saintgeorgeupperdarby.org/uploads/1/3/0/8/130814133/mobinam-radazuv.pdf
    • http://dikez.bsg-cbrne.us/uploads/1/3/0/8/130813528/09d8530f6aa66.pdf
    • http://xusafib.templecitypoodles.ca/uploads/1/3/1/0/131070420/vugikep.pdf
    • http://nakavo.vallenduuk.pl/uploads/1/3/1/0/131070382/labolilasuk.pdf
    • http://nafomidaf.aivets2018.eu/uploads/1/3/2/8/132814969/0dddc8bd0e6c00.pdf
    • https://static.usrfiles.com/ugd/f09a9d_0e8acdc763b64ebbbbddd90eea8d83df.pdf
    • https://static.usrfiles.com/ugd/e1d12c_a943b47ec1e942968e1db70b7f881d5a.pdf
    • https://static.usrfiles.com/ugd/dcf9ad_c5690b82221e4afea36233741a5d98bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2d59f632084276a5dc9f2cc36a11ed.pdf
    • https://static.usrfiles.com/ugd/359e64_f5ef42d5a3034bcb88145d31264ec2f5.pdf
    • https://static.usrfiles.com/ugd/d2759c_8e198da58a7f4860afaf92b5d5ef3002.pdf
    • https://static.usrfiles.com/ugd/c79b1c_00f94a477e4b4a70a5eaf371af065273.pdf
    • https://static.usrfiles.com/ugd/44b221_941c898e4c7b4721893bdc935bd00bb5.pdf
    • https://static.usrfiles.com/ugd/2b25e8_57d9b52b07d643d48116c39cc7372dad.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_off000088f1.bin
a71150baf76bd15355f08bcc0d2ce67ea80995faf6f5e4f880eb35ad11f882a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x88F1 4904 bytes
font_01_sfnt_off000099c4.bin
863e029b5579fbf57adb90628f7aaa95b1be57675e957fa3132ccf427f05ba8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x99C4 9920 bytes