Malicious PDF — malware analysis report

Static analysis result for SHA-256 74193e1a616c40af…

MALICIOUS

PDF

46.7 KB Created: 2020-08-30 09:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb60490c32f5509fb4b29bd34ba93b7b SHA-1: 3df42eb9943ce43f42c1d7f7b8cd1cface215c8a SHA-256: 74193e1a616c40afcd42aa03272e0f43e20efa19075233ebdbd486fcd8972187
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document body, though garbled, contains text related to grammar and the URL itself, suggesting a lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, further supporting the malicious intent.

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=5+oraciones+con+adjetivos+calificativos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ef2b933a735040d496d20ab50877c2cd.pdf
    • https://static.usrfiles.com/ugd/5b5da7_5b6dca84224047189068244de8b3f607.pdf
    • https://static.usrfiles.com/ugd/e6092c_896e7ceb00aa4700951f4237eb296f9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_03fbd1bd927c41cbb0536c36f0d57b72.pdf
    • https://static.usrfiles.com/ugd/b8c837_778fabad083c45bcac7329df819bf7d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fab6ea02989040ffa9f81bd0e7f73aa6.pdf
    • https://static.usrfiles.com/ugd/b8c837_17a5fc63bfaa451aaf22abc72bd1edbe.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_cb21b4b7e1fd4e4f911cc76ce45ede15.pdf
    • https://cdn.shopify.com/s/files/1/0437/5835/4584/files/types_of_placenta_in_mammals.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/20885143608.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/84124613889.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceb9385c38a94f67ae156edaa31c7a55.pdf
    • https://static.usrfiles.com/ugd/963627_eb7335c50d6b417bbf8b1b31e04b971f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7430fe01572444d5a71cf611f5bbdda0.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a0.bin
705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A0 6440 bytes
font_01_sfnt_off00007594.bin
b018fcc22781b6338994662f7e096774bd5960a778c1bc423db2c4b7311f98f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 5180 bytes
font_02_sfnt_off00008746.bin
228d16604771d6319f502e84db0e5009fbc0619cd346482174fc8a00e68b4704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8746 11168 bytes

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