Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c82cdb5a0351328…

MALICIOUS

PDF

41.8 KB Created: 2020-08-26 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db5064a9a0189e1e3928dd36f5c4439 SHA-1: 61cfde9014ed8d0e72d9c3b7f7353ff510d2a1f0 SHA-256: 6c82cdb5a0351328010f7c73e87dde7c07eb174c3a1df1408f66eee47fc55448
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 17 external PDF links, including a redirector to ttraff.com. The document body, though heavily obfuscated, contains the same URLs, suggesting a lure to download further content or visit malicious sites. The ML classifier strongly indicates maliciousness.

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=kubota+b2150+hst+manual
    • http://files.sweetpapercreations.com/uploads/1/3/1/4/131453252/e6c7daba1.pdf
    • http://files.ericmccarron.com/uploads/1/3/0/8/130874382/3594543.pdf
    • http://files.sandaharrboerboels.com/uploads/1/3/2/6/132681566/6896535.pdf
    • http://files.mathbag.com/uploads/1/3/2/7/132710797/nudexakuzugokupipeku.pdf
    • http://musulevu.ljcollinsauthor.com/uploads/1/3/1/8/131856725/6607415.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0446/7530/1539/files/cascade_control_system_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/gulavenedoletipemigela.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7333/files/vutag.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/43774421368.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/94342826934.pdf
    • https://cdn.shopify.com/s/files/1/0437/5478/2869/files/21124238287.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4918/files/30177440824.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/269375156.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/human_anatomy_mckinley_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/nitivinulegesagig.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/70353766332.pdf
    • https://cdn.shopify.com/s/files/1/0445/5170/0644/files/99998419978.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ef.bin
a08c63627cbde0e8d235dd6e5b094b829fa6986bd310f4cc9c805e18c7048f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EF 5104 bytes
font_01_sfnt_off00006a21.bin
db3e2c14425cbc6b0b7b19f2c1031af6e16ec12b07024ce06caf63af66e0bab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 9896 bytes
font_02_sfnt_off00008c2c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2C 4324 bytes

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