Malicious PDF — malware analysis report

Static analysis result for SHA-256 8037429d05dfce2c…

MALICIOUS

PDF

43.0 KB Created: 2020-09-03 00:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8198a3c0f5344e9711621498098f5d6a SHA-1: 51cb0c1295c4f67f193f43cf7f34422a6bb3bb0d SHA-256: 8037429d05dfce2c684843d556cc08e49cbec77ad5163bf8334685d8234a023d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as interview questions. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation or to obscure the malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for further exploitation or phishing.

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/wix?keyword=front+office+receptionist+interview+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/rise_to_ruins_cheat_table.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/61250761914.pdf
    • https://cdn.shopify.com/s/files/1/0437/9682/4221/files/74667213309.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/aristoteles_libros.pdf
    • https://static.usrfiles.com/ugd/37987b_17c3043390134ad4835560fbbd3d2e5d.pdf
    • https://static.usrfiles.com/ugd/f515ca_8f8be6f0e36542789e1b3d62363664af.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1edcb8a83c94dfea2c829b95e17ac54.pdf
    • https://static.usrfiles.com/ugd/ab922d_bf576d0cde5345c181e50dc22ac6a669.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/google_sheets_right_to_left_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/16263797208.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/ccsa_checkpoint.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e58.bin
5d9f1620e77e6cd4223bc2565a485d17d0689e2770fa31ea3ccdcdb368fef7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E58 5232 bytes
font_01_sfnt_off00007046.bin
0852b36002a60f569cd9424ae62db1c1e9fc6f7575d83c87dc52341de5ed9730
pdf-font-stream PDF embedded font (sfnt) at offset 0x7046 9492 bytes
font_02_sfnt_off000090b7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x90B7 4324 bytes