Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b163fbb2603fbc…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 03:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3675b631442f3130383a089c4dbcde9 SHA-1: dc63426036ddebcbb3ff45ec68b86aa3003487dd SHA-256: 40b163fbb2603fbcc1d7e0bfda29029791a42bf54d58257ada97fe0d747919f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=concepto+de+sociedad+pdf'. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which lead to benign content on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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=concepto+de+sociedad+pdf
    • https://static.usrfiles.com/ugd/1c90dc_da5264ac53b14a5498849a2334b63836.pdf
    • https://static.usrfiles.com/ugd/1cfe37_d7bb13d982274657a0edd41e90c0b20a.pdf
    • https://static.usrfiles.com/ugd/0a593f_8a2229c8ac2e4e189972de926ff0312c.pdf
    • https://static.usrfiles.com/ugd/80c1db_efb6c7a40ccd4bf3812628e3e763cb6c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/spain_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4549/4684/files/98930254986.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/mutoxirarajumiteb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/vujuloxivenuzaporadalew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/form_5498-_sa_turbotax.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0888/files/13856704327.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/bixupavul.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/pdf_praktikum_akuntansi_perusahaan_jasa_dagang_dan_manufaktur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fb.bin
43861667b49f7221b6e7e022d6ab6f94a94c44bc749a9c31285e6a6a67a82f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 4832 bytes
font_01_sfnt_off00007378.bin
2b82afa9792077cd7dcd1101640b410bb9f2b79f621748580e51ddc48be9b6b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 11092 bytes
font_02_sfnt_off00009779.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9779 4324 bytes