Malicious PDF — malware analysis report

Static analysis result for SHA-256 273801c706de2f8d…

MALICIOUS

PDF

41.2 KB Created: 2020-08-08 05:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e66092d199fe21b278d76cc5f6ef5e8b SHA-1: 4892d3ac5b53926e7b53b7ce0badf9aae86ab9d9 SHA-256: 273801c706de2f8d46a404bb9287ec247db0a709e7c1e751df04f70f6bf9815b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=the+candy+shop+war+2+pdf'. Additionally, it hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=the+candy+shop+war+2+pdf
    • http://files.gunillaoffmarket.com/uploads/1/3/2/6/132681690/f1c5d.pdf
    • http://files.caldanpartners.com/uploads/1/3/0/8/130813095/73c4c0eefd01.pdf
    • http://files.erikweasenforth.com/uploads/1/3/1/4/131438464/2878048.pdf
    • http://pisanapu.heidisfoundation.com/uploads/1/3/1/6/131636612/lanolipevuju.pdf
    • http://fonevove.kerenwheeler.com/uploads/1/3/0/7/130775320/f48228a06a2c13.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdf
    • https://cdn.shopify.com/s/files/1/0435/6754/6527/files/97011045326.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/ukulele_risk_of_rain_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/gapedepoverifoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/klasifikasi_anemia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5840/files/atencion_alternante.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/28066678136.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/neoplasia_maligna_de_pulmon.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/54023269267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/59976006090.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5908/files/bidokebuvaduve.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_off00005fe0.bin
2897623753a3988e247774df5b28b8d3542aa0f296509d71fcc5146aa538d303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 5484 bytes
font_01_sfnt_off000072a0.bin
c050b05518c633e5876fdb5b196a5af28fd4ef98eea2ec5743806e8226d80793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 10988 bytes

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