Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d1276fcc6f293c…

MALICIOUS

PDF

38.0 KB Created: 2020-08-12 04:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3417ae22a46f998db144e079f21f2c1 SHA-1: 7fe2be9ba15ccff34f31303f533e0472a3864306 SHA-256: 35d1276fcc6f293cefd79f8929766c53c2b7499ab71326cc5c162f5b136ddf0e
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or benign-looking content farms. The primary malicious link identified is https://ttraff.cc/pify?keyword=abacus+level+4+worksheets+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and others, suggesting a link-farming or redirection-based attack. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=abacus+level+4+worksheets+pdf
    • http://files.wellspringfertility.com/uploads/1/3/2/7/132710732/6829897.pdf
    • http://lopak.bondybluereview.com/uploads/1/3/1/1/131163599/dasixomu.pdf
    • http://files.salahghazzal.com/uploads/1/3/2/3/132303269/jusoru.pdf
    • http://files.modern-kuntao.com/uploads/1/3/1/8/131856188/7304399.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/jabimejurujorumitelazozum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/xovege.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/54543263652.pdf
    • https://cdn.shopify.com/s/files/1/0428/9953/8087/files/76109299640.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/google_snake_bot.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/favezokuwigovezamizewasak.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/74204385942.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/7075598496.pdf
    • https://cdn.shopify.com/s/files/1/0431/9176/3105/files/fevelovobukeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/91754325640.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/82631170286.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/lajen.pdf
    • https://cdn.shopify.com/s/files/1/0449/5589/3928/files/split_file_to_jpg.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_off00004c5e.bin
2b43c986ea9cb9a48716b54c81f6e3f6767aa59682763d8080d89bf7d08d3f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C5E 5676 bytes
font_01_sfnt_off00005fb2.bin
1391410936632ec8c8b08014f1e8922dd6cb735f63758ae1f4f23ed7ad731e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 13092 bytes

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