Malicious PDF — malware analysis report

Static analysis result for SHA-256 461390a9091dd796…

MALICIOUS

PDF

40.7 KB Created: 2020-07-22 04:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9ccfc8d1a393cb249701b1e03b1cd78 SHA-1: bee61d9b94052961512f4b7c6ff4a54037c3c570 SHA-256: 461390a9091dd7964f35dd172e5c670ae1f1089536c1da339bdf2f75cdf24f51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to a 'Trojan horse' book. The presence of a mass external PDF link farm further indicates malicious intent, likely to distribute malware or phish for credentials.

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.com/pify?keyword=pdf+libro+caballo+de+troya+9+cana
    • http://files.periachurch.com/uploads/1/3/0/9/130969915/25d0ca.pdf
    • http://files.tc-const.com/uploads/1/3/2/7/132740987/1277292.pdf
    • http://files.arsalynyouthforums.org/uploads/1/3/0/7/130740504/0acb65d06fe9.pdf
    • http://files.campboulderinthewoods.com/uploads/1/3/0/8/130814169/ac56d.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/86027696767.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/22637063038.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/86566904601.pdf
    • https://cdn.shopify.com/s/files/1/0428/2613/7756/files/jasexirekunivobivimijupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/kagat.pdf
    • https://pajuxegob.files.wordpress.com/2020/06/seguxaxejema.pdf
    • https://zanixef.files.wordpress.com/2020/06/30092632014.pdf
    • https://jefogusiku.files.wordpress.com/2020/06/zebewonukelatuketigajaj.pdf
    • https://lobetaxaj.files.wordpress.com/2020/06/zadixipulidi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/buriliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/wewukuwuvaruto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/jukowamomekusewenezedog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/1691169443.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/3138386838.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/fejokozepomoxex.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/lolelirizebox.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7263/files/85682553569.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://cdn.shopify.com/s/files/1/0429/6241/9863

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edd.bin
fea1bee88f68e35e6d4ba91606deb6cdbbfba88f641780e964c33b980b9b2a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 5024 bytes
font_01_sfnt_off00006ff7.bin
a9963d8001722cdb41798f4c4dc4dd1235ea8d485795bfd3d1b9050374b749a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF7 10940 bytes

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