Malicious PDF — malware analysis report

Static analysis result for SHA-256 1578da713b9fde13…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 05:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e2d5cff0b43726a602ef84b6916aea SHA-1: c1e549a4bf02036c95e2e625d23da24308d0c323 SHA-256: 1578da713b9fde13e8eeca5c901cdc00576d41336b57a86a2a0852b13f811e98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, reinforcing the likelihood of 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.me/wix?keyword=sweat+zora+neale+hurston
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/44478206644.pdf
    • https://cdn.shopify.com/s/files/1/0439/5089/9368/files/vofoluzuxipumomokimuzizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/tiginut.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee5d07c5b341415f93131826afc6ad34.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ca9236a8cce4246a9ea33e387d48a58.pdf
    • https://static.usrfiles.com/ugd/9f6a24_fc23f292493b477299c4151172860440.pdf
    • https://static.usrfiles.com/ugd/6116da_f3f62fa14fa942d59b734cd2dafe85ee.pdf
    • https://static.usrfiles.com/ugd/98857b_ec90faeb0efa4b5c853055a894e2f766.pdf
    • https://static.usrfiles.com/ugd/ea2f88_246d952d39c14eeda65880f428c9eda3.pdf
    • https://static.usrfiles.com/ugd/2f7815_a473c5964e3b40d2a490f263a6cacec9.pdf
    • https://static.usrfiles.com/ugd/b8c837_aacdb2b4e93540f9b50dc859f16f846e.pdf
    • https://static.usrfiles.com/ugd/8dde66_f8fe9fe536f840beba26d0ac7ce308a4.pdf
    • https://static.usrfiles.com/ugd/02beb7_0846d909020841c7a5499145bef21fd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2baf3123d5914fa188f56659c9d14a21.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7d1ee1b78a9442ca693c84e1bd26f27.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_off00006843.bin
20fe9f4f6cbc79e9141a2f753b486f06c923530f0f057c6b78e9771dbb4ca9fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6843 5016 bytes
font_01_sfnt_off00007957.bin
d8e198c99ae0f84cd36ac6a46bfe7dcc988245efc1fd592f5bcec3b00dd5624a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7957 10252 bytes