Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6a399840e27367…

MALICIOUS

PDF

53.4 KB Created: 2020-07-28 14:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b32684829b98c74bcb1dcd964deefc3 SHA-1: 5e54a81bd5b9efdd6542998693ca23142217209a SHA-256: 4d6a399840e2736726686fd0d398df79ec004c05df2d54cd95fb452fe7c612dc
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a tutorial link, which is a common lure for phishing or malware delivery. The PDF also hosts a large number of external PDF links, likely for SEO manipulation to improve search engine ranking for malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly suggests a malicious intent to lure users to harmful sites.

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=after+effects+cs6+text+animation+tutorials+pdf
    • http://files.panama-yachting-services.com/uploads/1/3/2/7/132740337/pobubuwapulijojetaka.pdf
    • http://files.limoservicefortworth.org/uploads/1/3/1/4/131438296/xisebisobefapub-makepenovu.pdf
    • http://files.kmccreations.com.au/uploads/1/3/1/4/131454670/592959.pdf
    • http://files.makeupbytalin.com/uploads/1/3/0/9/130969158/zegufegofagoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/22269021475.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2675/files/koxabitisurobaleruded.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/91633335690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/58706144341.pdf
    • https://cdn.shopify.com/s/files/1/0435/0869/5200/files/dalisuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/fupumudevatisujikinuxivux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/61617228562.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/36885756643.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/39123869600.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/gagekegusuterufevoparur.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/45207012653.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/rojix.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_off000091f0.bin
b4642aa9f420bcf394fa9b08e26e524314d9fe5503126ea06f720dff6ccc60fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F0 5396 bytes
font_01_sfnt_off0000a42b.bin
0472140a49b55fb4007a3c9634b6c7d2017dd06302ffa96ecbf5c67eb616f87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA42B 10672 bytes

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