Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f37f262a8fecab…

MALICIOUS

PDF

39.5 KB Created: 2020-09-10 06:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 873deb28fa2abed02587a1e9d617b67c SHA-1: 3cb8d0b31e615b157d97b9de73d8fe0e58b391f2 SHA-256: 15f37f262a8fecab35447296e8e9d83dd72075b989200a985bab737d4113e3ae
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a malicious intent to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF. The presence of a redirector link suggests an attempt to obscure the final destination, likely a phishing page or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.link/wix?keyword=catherine+tate%2527+s+nan+episode+guide
    • http://files.rodolfoangeloni.net/uploads/1/3/0/7/130776877/napasejizedokopivupo.pdf
    • http://files.uconnpremedicalsocietynewsletter.com/uploads/1/3/1/4/131437247/4518692.pdf
    • http://files.onceuponatimeinva.com/uploads/1/3/0/8/130874361/3153761.pdf
    • http://files.saintjohnsmilton.org/uploads/1/3/0/7/130738719/gegavimamukogoxu.pdf
    • http://files.hawthorneforge.com/uploads/1/3/0/7/130775242/61d99a8d.pdf
    • http://files.pvtechsolutions.com/uploads/1/3/1/4/131437725/7602133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0ec4e67aac3a43b5b02e31a3907255ab.pdf
    • https://static.usrfiles.com/ugd/6cf392_9c4902809642468389eadc8f14c27518.pdf
    • https://static.usrfiles.com/ugd/65e777_ca4275a1301c486592e7c7577abe78ff.pdf
    • https://static.usrfiles.com/ugd/62e2c1_a3eb0639af54413a8c05750576c8a78d.pdf
    • https://static.usrfiles.com/ugd/6240f8_04068971fb1542de98018fbc5430649d.pdf
    • https://static.usrfiles.com/ugd/c1de29_e0b670c60bba4247946cc18ec56c7816.pdf
    • https://static.usrfiles.com/ugd/ac51ce_f18fb704cd1344b08d1876c5a926b3fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_84a4c545ef504f52b25e81874ff57296.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_off0000502d.bin
7657901d97b8d47a0647176384c384c182a116334a5f697eeedfc5402189b5ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x502D 5128 bytes
font_01_sfnt_off0000619b.bin
3fae8c1958e5a9a8d3e0af3bac088f9fd65830d16d304c30f646d76c2d113aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619B 14436 bytes

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