Malicious PDF — malware analysis report

Static analysis result for SHA-256 b920c0b016e59743…

MALICIOUS

PDF

34.4 KB Created: 2020-08-30 12:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f1ec80eed7b0a0cd9960c2ec7c753a SHA-1: fc42f2cc59c7bd96f53eac9c9bab67e4d241ec10 SHA-256: b920c0b016e59743e6faa4c752a7357fd84792d0d32995a49b128121c185d42d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link farm with numerous embedded URLs, including a suspicious redirector at 'https://ttraff.ru/wix?keyword=ere+we+go'. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the malicious URLs, suggesting the primary purpose is to lure the user to malicious infrastructure.

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.ru/wix?keyword=ere+we+go
    • https://cdn.shopify.com/s/files/1/0437/6127/0935/files/31285323477.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4968/files/23099602694.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/steel_manual_15th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/19592349114.pdf
    • https://static.usrfiles.com/ugd/b85eb0_b35bbf27efcc4754aa59d0763f1ca76e.pdf
    • https://static.usrfiles.com/ugd/41a0b6_3af9b3f0fd54470099d6272b438fabca.pdf
    • https://static.usrfiles.com/ugd/a107db_207c3dc3140749339709c7a2994a9899.pdf
    • https://static.usrfiles.com/ugd/09c3c7_aaa6211c6d564934b2d031d521aa358a.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/bezunut.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/wamefus.pdf
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/15024683619.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6376/files/poragozixoluvofadabigo.pdf
    • https://cdn.shopify.com/s/files/1/0451/6462/6074/files/achilles_tendinopathy_exercises.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e7d523d89d94073bf95834d739e8516.pdf
    • https://static.usrfiles.com/ugd/7198c1_7cde32ce56a1485bb12012d9d57d80cd.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_off00004246.bin
efd2787e9f47a838ee076fa03419789469532fb63324c2c47756a13c170d144f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4246 4480 bytes
font_01_sfnt_off0000519c.bin
0e0259ac06b5e63c9fbbe0b63de04b6375a8b8a1b56afe9f0e4286666c95e82a
pdf-font-stream PDF embedded font (sfnt) at offset 0x519C 2128 bytes
font_02_sfnt_off00005b6a.bin
21ae0b793ad8576e87b6a99cfc83c2af9e3e33cad193d6dcec24868c48ea97a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6A 9888 bytes