Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d74a8df8d25249…

MALICIOUS

PDF

35.4 KB Created: 2020-08-14 17:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29dd1ff1a17b44de31c31ea8ccb2941a SHA-1: 1cc8a65a0bb38baaa4f7eff3e95ee17096ec8bd5 SHA-256: c3d74a8df8d25249cdd93a563d19a53a798b90de552e19672d500e500ff09ccf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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/pify?keyword=guidecraft+better+builders+30+piece+set
    • http://pamezep.trevorlakecomputers.com/uploads/1/3/2/6/132682137/9291834.pdf
    • http://files.4toebooth.com/uploads/1/3/2/6/132680994/71b43efb44adf1.pdf
    • http://files.manalgarciafitness.com/uploads/1/3/1/8/131871622/4480864.pdf
    • http://files.lincolnwoodelementarylibrary.com/uploads/1/3/1/3/131383330/volanebemazo_jadugejitopok_panelavetifafi_nufog.pdf
    • http://files.jennifercarrpainting.com/uploads/1/3/1/8/131857421/7964702.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/raxuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6278/files/sobutuko.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/contoh_lks_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0436/7283/0105/files/3rd_grade_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewefezagabujam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/48703760461.pdf
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/cadette_entrepreneur_badge_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/63111306391.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/rafigulatuxinipiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7306/0520/files/la_canzone_del_sole_testo_e_accordi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/bio_plastic.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/lufuponit.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_off00004b1e.bin
416bd98a7a5b8bbb5a42dbc4f89241b43bc3eb946743ae9e96b2e017a06d54f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1E 5624 bytes
font_01_sfnt_off00005e3f.bin
6e5a42ff36c1e78ea5cc8300c47a4c10b2dff1b0329ddd1033d87fd12aa3db42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 10000 bytes

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