Malicious PDF — malware analysis report

Static analysis result for SHA-256 f316838c0c67d11b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 04:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0051742b145b93885cb7745744b9967 SHA-1: 8c39c1d55a0ce5743b2fe1480a04b23ce504595b SHA-256: f316838c0c67d11b71e900c04acc1d0a19ec43e0832d149d9a2c6cfec58c0dbd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to malicious content.

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/pify?keyword=tratamiento+de+rinitis+alergica+en+ni%25C3%25B1os+pdf
    • http://files.haydensheroesmd.org/uploads/1/3/1/4/131437295/729698.pdf
    • http://files.jbmconsultants.org/uploads/1/3/1/3/131379622/2693478.pdf
    • http://files.nelsonmota.com/uploads/1/3/2/7/132710634/guwukanegewirem.pdf
    • http://files.segamatbikers.com/uploads/1/3/0/9/130969254/3f255dbd5de4fd.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/24121585948.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/balebobigebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/lulujilibutilagexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/poparotize.pdf
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/15367247177.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/12470550979.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/nanevajemagedewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/pandas_read_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/28935797185.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/android_record_audio.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.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_off000067b7.bin
6c55957a02356f520b7d79bc12589f78f1436d87c7c043c908ac83fa1a91e9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 5636 bytes
font_01_sfnt_off00007a8b.bin
0c2063374f1fad8e26b4fffba645926864b197a0d703d716c1fa8e9d34988064
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8B 10996 bytes