Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7259f139515acba…

MALICIOUS

PDF

41.3 KB Created: 2020-09-06 21:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358443c07a80d3ead56b46a3b1bade18 SHA-1: 268525ae81f59a78d3fbe3fca30dd8c2c2de4afb SHA-256: e7259f139515acba48e4d7b32fe32697102697eddb6b570b64597ff8441e21a0
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as information about ceasing trading with HMRC. The document body, though heavily obfuscated, contains the malicious URL and references to HMRC, reinforcing the phishing lure. The presence of numerous other PDF links suggests a link farm or redirection strategy to obscure the ultimate destination.

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=inform+hmrc+company+ceased+trading
    • https://static.usrfiles.com/ugd/ad8f3a_380fb1a15ef7472684b29994e8012822.pdf
    • https://static.usrfiles.com/ugd/880a7e_66644a46a5604f3fac7f6adec7ac78a5.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_d027b5ce6cdb40e3bbed55a1818075cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e543a84ac842c8b8da92c186c818f7.pdf
    • https://static.usrfiles.com/ugd/01bc73_f32189f2ca2a4bcbbe8d6f1c6aab4d57.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/rolusirupuwidinaxudus.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/69712701213.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/excel_2020_vba_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/generac_4000xl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2438/4154/files/remedios_preciosos_contra_las_artimaas_del_diablo.pdf
    • https://static.usrfiles.com/ugd/8aba0c_129aca4c8e894de18407a635d7d9e48e.pdf
    • https://static.usrfiles.com/ugd/b7306e_cc105212a6ff448ab13d80e92af5bb12.pdf
    • https://static.usrfiles.com/ugd/b8c837_e845fd0198bb4c04b1eee8f4c57892d6.pdf
    • https://static.usrfiles.com/ugd/40512e_27e9c9a8f0de40e2be7afedfffb3857c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3544602e03e64af2b92d58f3b9961831.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/resegofafuwadokoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/tifutipipumiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/st750lm022_hn-_m750mbb.pdf
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/xipusupagigufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/sexotosi.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_off000062bf.bin
8b5996419a4b5749314f34a421f147ac05016d8346fa25c3c8194963be7b324c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BF 5576 bytes
font_01_sfnt_off0000759b.bin
4285be3d2ab1ac5d39da4498fdf88c04103ba94dc7a82f8278309bd0abd93202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 10152 bytes

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